Tenex Therapy: Uses, Evidence, Risks and What to Expect

Written and medically reviewed by
Dr Dinesh Sirisena
Consultant in Sports, Exercise & Musculoskeletal Medicine
Triaxis Sports & Joint Clinic

Tenex therapy is a minimally invasive procedure that uses ultrasound guidance and ultrasonic energy to remove selected abnormal soft tissue through a small skin opening. It is mainly used for persistent tendon and fascia conditions that have not improved with appropriate conservative care. Studies report improvements in pain and function in selected patients, but much of the available evidence is based on observational studies rather than large comparative trials.

What is Tenex therapy?

Tenex therapy is a minimally invasive procedure used to remove selected abnormal tendon or fascia tissue through a small skin opening. The Tenex Health TX system uses ultrasonic energy together with irrigation and aspiration, while imaging helps the clinician identify and treat the intended area.

The formal medical terms are usually:

• Percutaneous ultrasonic tenotomy for tendon procedures
• Percutaneous fasciotomy for fascia procedures

The Tenex Health TX system is classified by the U.S. FDA as an ultrasonic surgical instrument. FDA records describe it as an ultrasonic surgical aspirator that fragments, emulsifies and removes soft tissue.

How does Tenex therapy work?

Tenex uses a small ultrasonic instrument placed into the treatment area under image guidance. The device delivers ultrasonic energy to fragment selected tissue while fluid irrigates the area and aspiration removes the fragmented material. The aim is to remove targeted abnormal tissue rather than simply inject medication into it.

The basic process involves three functions:

Ultrasonic energy
The device tip vibrates at ultrasonic frequency and interacts with the selected tissue.

Irrigation
Fluid is delivered to the treatment area.

Aspiration
Fragmented tissue and fluid are removed through the device.

This makes Tenex different from steroid injections, prolotherapy or PRP.

Tenex works by removing selected tissue that is not healing. Recovery is then supported by the body’s natural healing, rehabilitation and a gradual return of tendon capacity.

What conditions has Tenex therapy been studied for?

Tenex has primarily been studied for chronic tendinopathy and selected fascia conditions that remain symptomatic despite conservative treatment. Published studies include several tendon regions, although the amount and quality of evidence vary significantly between anatomical sites.

Research has included:

• Tennis elbow or lateral elbow tendinopathy
• Golfer’s elbow or medial elbow tendinopathy
• Achilles tendinopathy
• Patellar tendinopathy
• Gluteal tendinopathy
• Rotator cuff-related tendon disease
• Plantar fasciopathy
• Other selected chronic tendon disorders

A 2024 systematic review identified studies across 11 tendon sites and found that published reports generally showed improvements in pain and function after percutaneous needle tenotomy or Tenex.

This is why results from one tendon should not automatically be applied to another.

What is tendinopathy and why can it become persistent?

Tendinopathy is a disorder of a tendon that can cause pain, reduced function and difficulty tolerating physical load. It commonly develops after repeated loading, sudden changes in activity or a combination of mechanical and individual factors. Persistent tendinopathy is more complex than simple inflammation.

Tendons connect muscles to bones and transfer force during movement.

For example:

• The Achilles tendon transfers calf muscle force during running and jumping.
• The patellar tendon helps transmit force through the knee.
• The common extensor tendon at the elbow is heavily loaded during gripping.
• The gluteal tendons help stabilise the hip during walking and running.

Persistent tendon symptoms may be associated with changes in tendon structure and load tolerance.

Therefore, treatment usually needs to address more than pain alone.

Who may be considered for Tenex therapy?

Tenex may be considered in selected patients with persistent tendon or fascia symptoms when the diagnosis is reasonably clear and appropriate conservative management has not provided sufficient improvement. It is not normally a first-line procedure for every episode of tendon pain.

Clinical assessment may consider:

• Duration of symptoms
• Exact anatomical diagnosis
• Severity of pain and functional limitation
• Previous rehabilitation
• Exercise and tendon-loading history
• Occupational demands
• Sporting requirements
• Relevant imaging
• Other medical conditions
• Alternative treatment options

A person with six weeks of tendon pain may therefore be managed very differently from someone with longstanding symptoms despite structured rehabilitation.

Does Tenex therapy actually work?

Studies of Tenex and similar percutaneous ultrasonic tenotomy procedures report improvements in pain and function for many patients with persistent tendinopathy. As a newer procedure, it continues to be studied, with larger comparative trials ongoing.

A 2021 systematic review found promising results for percutaneous ultrasonic tenotomy across a range of tendon conditions.

A newer 2024 systematic review included 10 studies covering 11 tendon sites. It reported improvements in:

• Pain
• Function
• Quality of life

with relatively few reported adverse effects.

For most patients, Tenex is best considered as one option within a broader plan for persistent tendon pain.

Is Tenex the same as tendon surgery?

Tenex is a percutaneous surgical procedure, but it differs from conventional open tendon surgery. It is performed through a small skin opening and uses ultrasonic instrumentation rather than a larger surgical exposure. The exact procedure, anaesthesia and recovery plan depend on the tendon and amount of tissue involved.

It is sometimes described as “non-surgical,” and Tenex themselves describe their underlying procedures as percutaneous tenotomy or fasciotomy.

Therefore, a more accurate patient description is:

“A minimally invasive percutaneous procedure” — i.e. treating a tendon through a small puncture in the skin rather than open surgery.

How is Tenex different from steroid injections, PRP and prolotherapy?

Tenex physically removes selected tissue using ultrasonic instrumentation, whereas steroid injections, PRP and prolotherapy involve introducing substances into or around musculoskeletal structures. Their mechanisms, evidence and clinical uses are different, and none should be assumed to be universally superior.

Steroid injection
Uses corticosteroid medication to reduce inflammation in selected conditions.

PRP
Uses a platelet-containing preparation derived from the patient’s blood.

Prolotherapy
Commonly uses a dextrose-containing solution.

Tenex
Uses ultrasonic instrumentation to fragment and remove selected tissue.

The choice, if any, should depend on the diagnosis and evidence for the specific tendon problem rather than simply choosing the newest procedure.

Why is musculoskeletal ultrasound used with Tenex?

Musculoskeletal ultrasound can help identify the affected tendon or fascia, assess surrounding structures and guide the Tenex instrument toward the intended area during the procedure. Ultrasound provides real-time imaging, but it does not by itself determine whether Tenex is necessary or guarantee a successful outcome.

Ultrasound may help assess:

• Tendon thickness
• Tendon structure
• Partial tears
• Calcification
• Surrounding bursae
• Nearby nerves and blood vessels
• Plantar fascia

During the procedure, imaging helps the clinician monitor the instrument relative to the target anatomy.

However, an abnormal ultrasound image does not automatically mean tissue should be removed.

Clinical symptoms and examination findings remain important.

Do I need an MRI before Tenex therapy?

Not everyone being assessed for Tenex needs an MRI. The appropriate imaging depends on the tendon, symptoms and clinical question. Musculoskeletal ultrasound is commonly useful because it can assess many superficial tendons dynamically, while MRI may be considered when deeper anatomy or another diagnosis needs clarification.

Possible imaging includes:

X-ray
May help identify calcification, bone spurs or other bone-related findings.

Musculoskeletal ultrasound
Can assess many tendons and guide the procedure in real time.

MRI
May be useful for deeper structures, more complex injuries or when another diagnosis is suspected.

Imaging should be used when it helps answer a clinical question, rather than as an automatic prerequisite.

What happens during a Tenex procedure?

During a Tenex procedure, the clinician identifies the treatment area using imaging, prepares the skin and administers anaesthesia as appropriate. A small opening is made, and the ultrasonic instrument is introduced toward the selected tissue under image guidance. The device then fragments and removes targeted tissue using ultrasonic energy, irrigation and aspiration.

A typical process may include:

1. Review of the diagnosis and treatment indication.
2. Ultrasound assessment of the tendon or fascia.
3. Discussion of benefits, limitations and risks.
4. Skin preparation and local anaesthesia.
5. Small skin opening.
6. Image-guided placement of the instrument.
7. Ultrasonic treatment and removal of selected tissue.
8. Dressing of the treatment site.
9. Post-procedure instructions.
10. Rehabilitation planning.

The exact steps vary according to the anatomical area.

Is Tenex therapy painful?

Tenex is commonly performed with local anaesthesia, so discomfort may be reduced during the procedure. However, patients may still experience pressure, soreness or discomfort during recovery. The amount varies with the treatment site, amount of tissue treated and individual response.

The manufacturer describes local anaesthesia as commonly used during the procedure.

After treatment, temporary symptoms may include:

• Local soreness
• Tenderness
• Mild swelling
• Bruising
• Discomfort with movement

Patients should receive clear advice about what to expect and when symptoms warrant further medical assessment.

The procedure should not be advertised as “pain-free”.

What are the possible risks of Tenex therapy?

As a percutaneous procedure, Tenex carries potential risks such as temporary pain, bleeding, bruising, infection and injury to surrounding structures. The exact risks depend on the anatomical area and individual medical circumstances. Published studies generally report few complications, but the available evidence is still limited.

Potential considerations include:

• Bleeding
• Bruising
• Infection
• Temporary pain flare
• Irritation of surrounding tissues
• Nerve or blood vessel injury
• Incomplete improvement
• Persistent or recurrent symptoms

Patients should also tell the clinician about:

• Blood-thinning medication
• Diabetes
• Allergies
• Active infection
• Previous procedures
• Relevant medical conditions

No procedure should be described as risk-free.

How long does recovery take after Tenex?

Recovery varies according to the tendon or fascia treated, severity of the original condition, physical demands and rehabilitation plan. Some activities may be restricted initially, followed by progressive movement and strengthening. A fixed return-to-sport timeline should not be promised because tendon recovery varies between individuals.

The manufacturer describes recovery instructions as varying by condition and notes that range-of-motion and strengthening exercises may be introduced after an initial period of rest.

A sensible rehabilitation plan may assess:

• Pain during daily activities
• Range of motion
• Strength
• Tendon load tolerance
• Work requirements
• Running or jumping ability
• Sport-specific function

Return to activity should therefore be based on progress, not simply the number of weeks since the procedure.

Do I still need rehabilitation after Tenex?

Yes, rehabilitation may remain important because removing selected tendon tissue does not automatically restore strength, movement or load tolerance. Progressive exercise can help the affected tendon and surrounding muscles adapt to everyday, occupational and sporting demands during recovery.

Rehabilitation may include:

• Education
• Temporary activity modification
• Range-of-motion exercises
• Progressive strengthening
• Tendon loading
• Movement retraining
• Return-to-running progression
• Sport-specific exercises

The exact programme depends on the anatomical site.

For example, Achilles rehabilitation differs substantially from elbow or gluteal tendon rehabilitation.

Tenex should therefore be viewed as one part of a broader management pathway where appropriate.

Can athletes have Tenex therapy?

Tenex may be considered for selected athletes with persistent tendinopathy, but sporting participation alone is not a reason to undergo the procedure. Diagnosis, previous rehabilitation, tendon function, competition demands and the available evidence should guide whether an intervention is appropriate.

Relevant sports may include:

• Running
• Tennis
• Golf
• Badminton
• Football
• Rugby
• Swimming
• Cricket
• Weightlifting

Different sports also load different tendons.

A runner with Achilles tendinopathy, for example, requires different assessment and rehabilitation from a tennis player with lateral elbow tendinopathy.

The objective should be restoring appropriate function rather than simply reducing pain quickly.

When should I seek assessment for persistent tendon pain?

Consider medical assessment when tendon pain persists, repeatedly returns or limits work, exercise or sport despite appropriate load modification and rehabilitation. Prompt assessment is particularly important after sudden injury, significant weakness, inability to bear weight or concern about a tendon rupture.

Assessment may be helpful when there is:

• Persistent pain over several weeks or months
• Reduced strength
• Repeated flare-ups
• Difficulty returning to sport
• Failure to progress with rehabilitation
• Sudden loss of function
• Significant swelling or bruising
• Concern about a partial or complete tendon tear

The first priority is establishing the diagnosis rather than deciding on a procedure.

How is Tenex therapy considered at Triaxis Sports & Joint Clinic?

At Triaxis Sports & Joint Clinic, Tenex may be considered for selected persistent tendon or fascia conditions following Sports Medicine and musculoskeletal assessment. The decision depends on the diagnosis, previous rehabilitation, functional limitations, imaging where appropriate, available evidence and alternative management options.

Assessment may include:

• Sports Medicine evaluation
• Musculoskeletal examination
• Sports ultrasound where appropriate
• Review of previous imaging
• Assessment of strength and tendon loading
• Review of rehabilitation already attempted
• Patient education
• Rehabilitation planning
• Shared decision-making

Where Tenex is considered, patients can discuss:

• Why the procedure is being considered
• Which structure is being treated
• Current evidence
• Potential risks
• Recovery expectations
• Rehabilitation afterwards
• Other treatment options

Depending on the individual’s condition and clinical assessment, certain procedures may be considered as part of a broader management plan.

Singapore MOH requires healthcare advertising content to remain accurate and truthful and not contain exaggerated claims that could encourage unwarranted healthcare use.

Frequently Asked Questions About Tenex Therapy

Does Tenex therapy cure tendinopathy?

No. Tenex should not be described as curing tendinopathy. It uses ultrasonic instrumentation to remove selected tissue, but pain and function depend on multiple factors including tendon load, strength, rehabilitation and the underlying condition. Current studies report improvements in selected patients, but the evidence base remains largely observational and does not establish guaranteed or permanent results.

Is Tenex therapy FDA approved?

A more accurate term is FDA cleared, rather than “FDA approved.” The Tenex Health TX System has received U.S. FDA 510(k) clearance as an ultrasonic surgical instrument. FDA records describe the system as an ultrasonic surgical aspirator. Clearance of the device does not mean Tenex has been proven superior to other treatment options for every tendon disorder.

Is Tenex better than open surgery?

Tenex is less invasive because it uses a small percutaneous approach, but surgical decisions depend on the type and severity of tendon pathology, previous treatment and individual needs. Some conditions may not require surgery at all, while others may require conventional surgical assessment.

Can Tenex treat tennis elbow?

Tenex has been studied for chronic lateral elbow tendinopathy, commonly called tennis elbow, and published observational studies have reported improvements in selected patients. However, exercise-based rehabilitation remains an important management option, and Tenex should be undertaken as part of a combined treatment plan.

Can Tenex be used for Achilles tendinopathy?

Percutaneous ultrasonic tenotomy has been studied for Achilles tendinopathy. Not all Achilles problems are suitable for the procedure. Insertional tendinopathy, mid-portion tendinopathy, partial tearing and other causes of posterior ankle pain may require different management.

Does Tenex remove healthy tendon?

The intention is to identify and remove selected abnormal tissue while preserving surrounding structures, using imaging to guide the procedure. The procedure still depends on appropriate diagnosis, imaging interpretation and clinical technique.

How soon can I return to sport after Tenex?

There is no universal return-to-sport timeline. Progress depends on the tendon treated, symptoms, strength, sporting demands and rehabilitation. Patients may need a period of activity modification followed by progressive strengthening and gradual reintroduction of sport-specific loads. A fixed promise such as returning to sport within a particular number of weeks would not be appropriate.

Can Tenex replace physiotherapy or rehabilitation?

Not necessarily. Tenex addresses selected tissue but does not automatically restore strength, movement or tendon capacity. Rehabilitation may remain important before and after the procedure. Depending on the tendon involved, this may include progressive strengthening, load management, mobility work and sport-specific rehabilitation.

About the Author

Dr Dinesh Sirisena is a Consultant in Sports, Exercise & Musculoskeletal Medicine. His clinical work includes assessment and management of sports injuries and musculoskeletal conditions affecting tendons, muscles, joints, ligaments and related structures.

Medical Disclaimer

This page provides general educational information and does not replace individual medical advice. Tenex therapy is not necessary or appropriate for every tendon or fascia condition. Decisions about imaging, rehabilitation or percutaneous procedures should be based on individual symptoms, diagnosis, medical history, clinical findings and treatment goals.

Ultrasound-Guided Hydrodissection: Uses, Evidence and What to Expect

Written and medically reviewed by
Dr Dinesh Sirisena
Consultant in Sports, Exercise & Musculoskeletal Medicine
Triaxis Sports & Joint Clinic

Hydrodissection is a minimally invasive, ultrasound-guided procedure that uses fluid to gently separate tissues and free nerves, fascia and tendons from the structures pressing on or sticking to them.

It is used across a broad range of musculoskeletal problems — including nerve entrapments such as carpal tunnel syndrome, fascial and myofascial pain, and persistent tendon conditions such as Achilles and patellar tendinopathy. The technique is performed under real-time ultrasound so the clinician can see the needle and the injected fluid throughout, and it works well alongside rehabilitation and progressive loading.

What is hydrodissection?

Hydrodissection is an ultrasound-guided injection technique in which fluid is used to create space around a nerve, fascial layer or tendon, gently separating it from the surrounding tissue. This can relieve compression, reduce adhesions and improve the way the structure glides and moves.

Because it is performed under high-resolution ultrasound, the clinician can identify the exact tissue plane and watch the fluid spread in real time. The technique is also described in the literature as perineural injection therapy when applied to nerves, and as high-volume injection or high-volume image-guided injection (HVIGI) when a larger fluid volume is used around a tendon.

Hydrodissection describes the technique, not a single medicine. Depending on the problem, the injected solution may include:

• Normal saline
• Local anaesthetic
• 5% dextrose (D5W), often used for nerve-related pain
• Platelet-rich plasma (PRP) in selected cases
• Corticosteroid, where clinically appropriate

The choice of solution is tailored to the diagnosis, the structure being treated and the individual patient.

What conditions can hydrodissection treat?

Hydrodissection is used across three broad areas: freeing entrapped nerves, releasing adhered fascial and myofascial planes, and addressing the tissue changes around persistent tendon problems. The strongest evidence is for nerve entrapment, while its use around fascia and tendons continues to grow.

Nerve entrapment (nerve hydrodissection)

This is the best-established application. Fluid is used to release a compressed nerve from the tissue trapping it, restoring space and improving nerve gliding. Commonly treated entrapments include:

• Carpal tunnel syndrome (median nerve at the wrist)
• Cubital tunnel syndrome (ulnar nerve at the elbow)
• Deep gluteal / sciatic nerve entrapment
• Meralgia paraesthetica (lateral femoral cutaneous nerve)
• Baxter’s nerve and tarsal tunnel entrapment in the heel and foot

Fascial and myofascial release

Fluid can be used to separate adhered fascial layers and interfascial planes that contribute to pain and restricted movement, for example around the plantar fascia or the gluteal and piriformis region. This is an active and growing area of practice.

Tendon and paratendon problems (high-volume injection)

Around persistent tendon conditions such as mid-portion Achilles and patellar tendinopathy, a higher volume of fluid is placed between the tendon and the tissue in front of it — sometimes called high-volume “stripping.” The aim is to influence the small blood vessels and accompanying nerve fibres that are associated with tendon pain, as part of a wider loading and rehabilitation plan.

How does hydrodissection work?

Hydrodissection works mainly by mechanically separating structures that have become compressed or stuck together. Freeing a nerve from surrounding tissue can relieve pressure, improve its blood supply and restore normal gliding, while separating tissue planes around a tendon can influence the vessels and nerve fibres linked to pain.

For nerves, the goal is to release the nerve from compressive or scarred tissue so that its own small blood vessels and nerve fibres (the vasa nervorum and nervi nervorum) can function normally again. Some solutions, such as 5% dextrose, may also have a settling effect on irritated nerves beyond the mechanical release itself.

For tendons, chronic tendon pain is often accompanied by increased small blood vessels and nerve fibres around the tendon, which can be seen on Doppler ultrasound. Placing fluid between the tendon and the tissue in front of it is intended to separate these planes and influence those pain-associated structures. This is why the technique is combined with progressive tendon loading, which builds the tendon’s capacity over time.

What does the evidence show?

The evidence is strongest for nerve hydrodissection, where randomised trials and systematic reviews support its use in conditions such as carpal tunnel syndrome. Evidence for fascial applications is emerging, while for tendon conditions hydrodissection is best considered as one component of a rehabilitation-based programme.

For nerve entrapment, randomised controlled trials have shown that ultrasound-guided hydrodissection can improve symptoms and function in carpal tunnel syndrome, with benefits maintained over months. Systematic reviews and a network meta-analysis have reported that 5% dextrose is among the most effective injectates, with results comparable to corticosteroid at longer follow-up and an excellent safety profile. Contemporary reviews now position hydrodissection as a valuable step for patients who have not settled with splinting or therapy but who wish to avoid, or are not yet ready for, surgery.

For fascial and myofascial pain, published case series and ongoing trials describe encouraging results, and interest in interfascial hydrodissection is growing as ultrasound techniques improve.

For tendon conditions, results are more variable. A 2020 randomised controlled trial found that high-volume injection without corticosteroid did not add benefit over a small placebo injection when both groups followed a structured exercise programme, while a 2024 systematic review reported possible short-term improvement, particularly in protocols that included corticosteroid. Taken together, this supports using high-volume injection selectively and always alongside a progressive loading programme, rather than as a stand-alone treatment.

Is hydrodissection the same as prolotherapy, PRP or a steroid injection?

No. Hydrodissection describes an injection technique — using fluid under ultrasound to separate tissues — while prolotherapy, PRP and corticosteroid refer to the substances injected. Some hydrodissection procedures use one of these solutions, but the terms are not interchangeable.

In practice, the diagnosis and the structure being treated guide both the technique and the choice of solution. For example, a nerve entrapment and a chronic tendon problem may both be treated with hydrodissection, but with different injectates, volumes and target planes.

Why is ultrasound guidance used?

Ultrasound guidance lets the clinician see the nerve, fascia or tendon and the surrounding anatomy in real time, guide the needle precisely into the intended tissue plane, and watch the fluid spread exactly where it is needed. This precision is central to how hydrodissection works.

Sports and musculoskeletal ultrasound can also assess the target structure before treatment — for example the size and shape of a nerve, the thickness and structure of a tendon, or blood flow using Doppler imaging — and can be used dynamically while the joint or limb moves.

Who may be considered for hydrodissection?

Hydrodissection may be considered for people with a confirmed nerve entrapment, fascial pain or persistent tendon problem who are looking for a minimally invasive option, often after an appropriate period of conservative care. A clinical assessment, and usually ultrasound, help confirm the diagnosis and identify the right target.

Assessment typically considers:

• The specific diagnosis and where the problem is arising
• Duration and pattern of symptoms
• Response to previous treatment and rehabilitation
• Functional and sporting demands
• Relevant medical conditions and current medications
• Ultrasound findings

What happens during a hydrodissection procedure?

During hydrodissection, the area is examined with ultrasound, the skin is cleaned, and a needle is guided precisely toward the target nerve, fascia or tendon. Fluid is then introduced to separate the tissue planes while the clinician watches in real time. It is usually a day procedure.

A typical procedure involves:

1. Clinical review and confirmation of the diagnosis
2. Ultrasound examination of the target structure
3. Discussion of the expected benefits, the solution used and any risks
4. Skin preparation
5. Ultrasound-guided needle placement
6. Introduction of the tailored solution to separate the tissue planes
7. Post-procedure advice and rehabilitation planning

Is hydrodissection painful?

Most people tolerate hydrodissection well. It involves a needle and the introduction of fluid, so some pressure or temporary soreness is normal, and local anaesthetic is often included to keep the procedure comfortable. The amount of discomfort varies from person to person.

Any discomfort is usually related to the needle, the pressure of the fluid or an already sensitive area, and tends to settle over the following days. You will be given individual advice on what to expect and how to look after the area afterwards.

What are the possible risks?

Hydrodissection has a strong safety profile, and studies of nerve hydrodissection have reported very few complications. As with any needle-based procedure, considerations can include temporary soreness, bruising, a small risk of bleeding or infection, and irritation of nearby structures. Additional considerations apply when medicines such as corticosteroid are included.

To keep the procedure as safe as possible, it is helpful to discuss beforehand:

• Current and blood-thinning medication
• Allergies
• Diabetes
• Previous injections or procedures in the area
• Other relevant medical conditions

How long does recovery take, and will I still need rehabilitation?

Recovery varies with the condition treated and your individual response, and many people return to everyday activities quickly. Rehabilitation remains an important partner to hydrodissection — especially for tendon problems — because progressive loading builds lasting strength and capacity that an injection alone does not provide.

For nerve entrapments, symptom relief may develop over the weeks following the procedure. For tendon conditions, hydrodissection is most effective when combined with a graded loading programme, and return to running or sport is guided by function and comfort rather than a fixed timetable. Your clinician and rehabilitation team will tailor the plan to you.

How is hydrodissection considered at Triaxis Sports & Joint Clinic?

At Triaxis Sports & Joint Clinic, hydrodissection is considered following a Sports Medicine and musculoskeletal assessment. The clinic reviews the diagnosis, previous treatment, functional needs, ultrasound findings and the current evidence before discussing whether an ultrasound-guided procedure is a suitable option.

Where a procedure is appropriate, patients can discuss the solution being used, the expected benefits, any limitations and risks, and the alternatives, so that the decision is a shared one. Depending on the individual’s condition and clinical assessment, hydrodissection may be considered as part of a broader management plan that includes rehabilitation.

Frequently Asked Questions About Hydrodissection

Does hydrodissection help carpal tunnel syndrome?

Yes — this is one of its best-supported uses. Randomised trials and systematic reviews have shown that ultrasound-guided hydrodissection can improve symptoms and function in carpal tunnel syndrome, and it is increasingly offered to people who have not settled with splinting or therapy but wish to avoid or delay surgery. Your suitability is confirmed with a clinical assessment and ultrasound.

What is high-volume injection for tendons?

High-volume injection is the tendon-focused form of hydrodissection. A larger volume of fluid is placed between a painful tendon, such as the Achilles, and the tissue in front of it, to separate the planes and influence the small vessels and nerve fibres associated with tendon pain. It is used selectively and works best alongside a progressive loading programme.

Is hydrodissection a type of surgery?

No. Hydrodissection is a minimally invasive, ultrasound-guided injection performed as a day procedure. For conditions such as nerve entrapment, it is often considered as a step before surgery is needed.

What fluid is injected during hydrodissection?

It depends on the problem. Solutions may include saline, local anaesthetic, 5% dextrose, PRP or, where appropriate, corticosteroid. The choice is tailored to the diagnosis and the structure being treated, and you will be told what is being used.

Do I still need rehabilitation after hydrodissection?

For tendon conditions, yes — progressive loading builds lasting strength and capacity that an injection alone does not provide, so the two work best together. For nerve entrapments, activity and nerve-gliding advice often support recovery. Your plan is tailored to your condition.

How soon will I notice a difference?

This varies with the condition and the individual. Some people notice change within days, while for others relief develops over the following weeks. Return to sport is guided by function and comfort rather than a set number of days.

About the Author

Dr Dinesh Sirisena is a Consultant in Sports, Exercise & Musculoskeletal Medicine. His clinical work includes the assessment and management of sports injuries and musculoskeletal conditions involving muscles, tendons, ligaments, nerves, joints and related structures, including ultrasound-guided procedures.

Medical Disclaimer

This page provides general educational information and does not replace individual medical advice. Hydrodissection is not required or suitable for every person, and the right option depends on the diagnosis and clinical assessment. Decisions about imaging, rehabilitation or image-guided procedures should follow an individual consultation.

Hydrodilatation: Uses, Evidence, Risks and What to Expect

Hydrodilatation is an ultrasound-guided procedure most often used for frozen shoulder. A controlled volume of fluid introduced into the shoulder joint to gently expand the tightened joint capsule, usually together with local anaesthetic and, where appropriate, corticosteroid. It’s a well-tolerated day procedure with a strong safety record. It can help ease pain and improve movement — particularly external rotation, one of the movements most affected in frozen shoulder — and works best as part of a structured plan that includes rehabilitation.

What is hydrodilatation?

Hydrodilatation an ultrasound-guided shoulder procedure used most often for adhesive capsulitis, commonly called frozen shoulder. A controlled volume of fluid introduced into the glenohumeral (shoulder) joint to gently expand the tightened joint capsule. The fluid usually includes saline and local anaesthetic, with corticosteroid added where appropriate.

In frozen shoulder, the capsule surrounding the joint becomes tight, which brings on pain and progressively restricts movement. Hydrodilatation works with this problem directly: by introducing fluid under gentle pressure, it distends the capsule, creates more space within the joint, and helps restore movement.

Hydrodilatation also known as:

• Hydrodistension
• Joint distension
• Capsular distension
• Shoulder hydrodilatation

Although frozen shoulder the most common reason for the procedure, the same principle — using fluid to distend a tightened joint capsule under ultrasound guidance — can also be applied to help stiffness in other joints where the capsule has become restricted.

How does hydrodilatation work?

Hydrodilatation gently stretches and expands the tightened shoulder capsule by introducing fluid into the joint. This helps to create more room within the joint, ease movement and reduce pain. It’s a controlled, gradual process rather than a forceful one.

The shoulder joint is surrounded by a flexible sleeve of connective tissue called the joint capsule. In frozen shoulder, this capsule becomes tight and inflamed, and movement becomes restricted and uncomfortable.

During hydrodilatation, fluid is introduced into the glenohumeral joint under ultrasound guidance. The volume and gentle pressure distend the capsule, increase the available space within the joint, and help the shoulder move more freely. Where corticosteroid included, it can also help settle the inflammation that contributes to pain and stiffness.

This is best understood as gently distending and easing the capsule — creating room and improving mobility — rather than “breaking” or “tearing” anything. That description is both more accurate and a better reflection of what patients actually experience.

What’s frozen shoulder and why does the shoulder become stiff?

Frozen shoulder, or adhesive capsulitis, a condition in which shoulder pain and stiffness develop gradually because the capsule surrounding the joint becomes tight. Movement becomes restricted both when the patient moves the arm themselves and when a clinician moves the shoulder during examination.

The shoulder a ball-and-socket joint. The structures involved include:

Humeral head — the ball at the top of the upper arm bone.

Glenoid — the shallow socket on the shoulder blade.

Joint capsule — a flexible layer surrounding the joint.

Rotator cuff tendons — tendons that help control and stabilise shoulder movement.

Ligaments — connective tissues that help support the joint.

Muscles — including the rotator cuff, deltoid and shoulder blade muscles.

Nerves — supplying sensation and muscle control around the shoulder and arm.

In frozen shoulder, the main issue tightening of the joint capsule rather than simple muscle weakness — which exactly why a treatment aimed at the capsule itself, such as hydrodilatation, can be helpful.

Who may develop frozen shoulder?

Frozen shoulder commonly affects adults in middle age and can occur without any obvious injury. Certain medical conditions, particularly diabetes, are associated with a higher likelihood of developing it. A period of shoulder immobilisation after injury or surgery can also contribute.

Factors associated with frozen shoulder include:

• Age, particularly middle age
• Diabetes
• Thyroid disorders
• Previous shoulder injury
• Shoulder surgery
• Prolonged restriction of shoulder movement

Many people develop frozen shoulder without any clear trigger. Sports such as swimming, tennis, badminton, golf and weightlifting can make shoulder stiffness more noticeable, although the sport itself not usually the cause.

When may hydrodilatation be considered?

Hydrodilatation may be considered for patients with frozen shoulder when pain and stiffness continue to affect daily activity. It is one of several effective options and can be a helpful step for patients who want to ease symptoms and regain movement.

Management of frozen shoulder may include:

• Education and reassurance
• Appropriate pain management
• Activity modification
• Mobility and range-of-motion exercises
• Physiotherapy or rehabilitation
• Corticosteroid injection
• Hydrodilatation
• Less commonly, surgical procedures

The right choice depends on factors such as the stage and duration of symptoms, the severity of stiffness, pain levels, previous treatment, medical conditions, functional needs and patient preferences. Hydrodilatation fits naturally into this plan and often combined with rehabilitation to support recovery.

Does hydrodilatation help frozen shoulder?

Hydrodilatation can improve shoulder movement and comfort, and it’s particularly associated with improved external rotation — one of the movements most restricted in frozen shoulder. It’swell tolerated, has a strong safety record, and delivers its best results when combined with a structured rehabilitation programme.

Frozen shoulder generally has a favourable long-term outlook, and the aim of hydrodilatation to help patients get there more comfortably and with better movement along the way.

The evidence supports several encouraging points. A 2023 systematic review found that hydrodilatation could improve shoulder disability and passive external rotation compared with corticosteroid injection alone. A larger 2026 systematic review, covering 103 studies and 44 randomised controlled trials, confirmed better external rotation at 12 weeks compared with corticosteroid injection alone, with broadly comparable results on other measures such as pain and overall shoulder function. When hydrodilatation was combined with physical therapy or exercise, that same review found small additional improvements in pain and disability compared with therapy alone.

Taken together, this positions hydrodilatation as a useful, well-tolerated option within a broader management plan — most effective when paired with rehabilitation, rather than as a stand-alone cure.

How does hydrodilatation compare with a steroid injection?

Hydrodilatation and a steroid injection are not simply competing alternatives. Hydrodilatation can include corticosteroid while adding the mechanical benefit of gently distending the capsule — in effect combining both effects in a single procedure.

Because corticosteroid often part of the hydrodilatation solution, the useful clinical question rarely “hydrodilatation or steroid?” Instead, the approach tailored to the individual, and hydrodilatation offers a way to deliver capsular distension and, where appropriate, the anti-inflammatory effect of corticosteroid together.

The evidence reflects this. Recent research shows an advantage for external rotation after hydrodilatation compared with corticosteroid injection alone, with comparable results on other measures. For many patients, combining gentle capsular distension with rehabilitation offers a practical and effective route to easing symptoms and restoring movement.

Is hydrodilatation the same as a steroid injection?

No. A steroid injection describes the medication being injected, while hydrodilatation describes a technique in which a larger, controlled volume of fluid introduced into the shoulder joint to expand the capsule. Corticosteroid can form part of the hydrodilatation solution, so the two overlap.

A typical hydrodilatation solution may contain:

• Saline
• Local anaesthetic
• Corticosteroid, where appropriate

The key point for patients understanding both what being injected and why a larger volume used — the volume what allows the capsule to be gently distended, which the mechanical part of the treatment.

Is hydrodilatation performed with ultrasound?

Yes. At Triaxis, hydrodilatation performed using ultrasound guidance, so the joint and the needle can be seen clearly in real time throughout the procedure.

Ultrasound guidance offers several practical advantages:

• Real-time visualisation of the needle as it enters the joint, supporting accurate placement.
• No ionising radiation, unlike X-ray-based imaging.
• The ability to assess the surrounding tendons and soft tissues at the same appointment.
• A comfortable, in-clinic setting without the need for a radiology suite.

Under ultrasound, the clinician can identify the humeral head, the shoulder joint, the nearby tendons and the surrounding soft tissues, and watch the fluid distend the capsule as it is introduced. This precision one of the reasons ultrasound-guided hydrodilatation a reassuring and well-controlled procedure.

Do I need an MRI or ultrasound before hydrodilatation?

Frozen shoulder usually diagnosed through symptoms and physical examination, so not everyone needs an MRI beforehand. Imaging is used when it will answer a specific clinical question — for example, if the diagnosis uncertain or another shoulder condition needs to be assessed.

Different imaging tests have different roles:

X-ray — may help identify arthritis, fractures or other bone-related conditions.

Musculoskeletal ultrasound — assesses the rotator cuff tendons, the biceps tendon and other structures, and is also used to guide the procedure itself.

MRI — considered when deeper structures or an alternative diagnosis need investigation.

Imaging chosen to answer a clinical question rather than ordered routinely for everyone with shoulder stiffness.

What happens during hydrodilatation?

During hydrodilatation, the shoulder is positioned and the joint is identified using ultrasound. After the skin is cleaned, a fine needle is guided into the joint and fluid is introduced gradually while the clinician watches in real time. Patients are then given clear advice about movement and rehabilitation.

A typical appointment involves:

1. Clinical review of symptoms and diagnosis.
2. Explanation of what to expect, the benefits and the risks.
3. Positioning of the shoulder.
4. Ultrasound guidance to locate the joint.
5. Cleaning of the skin.
6. Placement of a fine needle into the shoulder joint.
7. Gradual introduction of the fluid to distend the capsule.
8. Post-procedure advice.
9. Rehabilitation planning.

The whole procedure is carried out gently and gradually, with the volume tailored to the individual shoulder and the patient’s comfort throughout.

Is hydrodilatation painful?

Hydrodilatation generally well tolerated. Local anaesthetic is usually included in the injection to keep the procedure comfortable, and most patients describe a feeling of pressure as the fluid introduced rather than sharp pain. Some temporary soreness afterwards normal and settles quickly.

Patients may notice:

• Mild needle discomfort
• A sensation of pressure inside the shoulder as the fluid is introduced
• Temporary soreness for a short period afterwards

Knowing what to expect helps most patients feel at ease, and the team will explain what is normal and what, if anything, should prompt a follow-up.

What are the possible risks of hydrodilatation?

Hydrodilatation has a strong safety record, and serious complications are uncommon. As with any injection, there are some risks to be aware of, and these are discussed with you beforehand so you can make an informed decision.

Reassuringly, a 2026 systematic review reported only two infections among 8,754 patients in the studies that recorded this outcome — around 0.02%, a very low rate.

Points to be aware of include:

• A temporary flare of pain or soreness
• Bruising or minor bleeding at the injection site
• A small risk of infection
• Reaction to medication
• A temporary rise in blood glucose if corticosteroid used, particularly relevant for patients with diabetes
• Skin or soft-tissue effects associated with corticosteroid

Sharing information about your medications, allergies, diabetes and other medical conditions before treatment helps keep the procedure safe and appropriate for you.

How long does hydrodilatation take to work?

Recovery varies from person to person. Some patients notice an improvement in pain or movement within the first few weeks, while others improve more gradually. Because frozen shoulder tends to improve over time, progress is best judged by how your movement and function are returning.

Clinical trials commonly assess outcomes over weeks to months, with particular attention to the 12-week mark, where hydrodilatation has shown a clear advantage for external rotation. Pairing the procedure with rehabilitation helps you make the most of the movement it creates and supports steady, lasting progress.

Do I still need rehabilitation after hydrodilatation?

Yes, rehabilitation an important partner to the procedure. Hydrodilatation creates more room and movement in the joint, and rehabilitation helps you use and build on that movement to return to daily and sporting activities.

Rehabilitation may include:

• Gentle shoulder mobility work
• Range-of-motion exercises
• Gradual strengthening
• Shoulder blade exercises
• Activity modification
• Progressive return to work or sport

Evidence supports this combined approach: a 2026 review found that adding hydrodilatation to physical therapy or exercise produced small improvements in pain and disability compared with therapy alone. Hydrodilatation and rehabilitation work best together, as two parts of one recovery plan.

Can I exercise after hydrodilatation?

Yes, gentle movement usually encouraged soon after the procedure, with the timing and intensity guided by your symptoms and your rehabilitation plan. The aim to build useful movement steadily rather than to force the shoulder.

Exercises often focus on:

• Forward elevation
• External rotation
• Internal rotation
• Shoulder blade control
• Gradual strengthening

For athletes, returning to swimming, tennis, golf, badminton or weight training guided by shoulder function rather than a fixed timetable, so you can return with confidence.

Can frozen shoulder recover without hydrodilatation?

Yes. Frozen shoulder often improves over time, and management can involve education, appropriate pain relief, activity modification, exercise and rehabilitation. Hydrodilatation one helpful option that can ease symptoms and restore movement sooner — it’s a choice, not a requirement.

Treatment tailored to your pain, stiffness, functional limitations, symptom duration, medical conditions, response to rehabilitation and personal preferences. Surgery is reserved for the small number of patients whose significant symptoms persist despite appropriate non-surgical management.

When should I seek medical assessment for a stiff shoulder?

Consider a medical assessment when shoulder pain and stiffness begin to restrict dressing, reaching, sleeping, work or exercise — particularly when movement has been limited for several weeks. Prompt assessment is also sensible after significant trauma or if you notice sudden weakness, marked swelling, fever or other unusual symptoms.

It’s worth seeking assessment when there is:

• Progressive loss of shoulder movement
• Persistent night pain
• Difficulty dressing or reaching overhead
• Difficulty reaching behind the back
• Significant weakness
• Recent trauma
• Fever or marked swelling
• Numbness or other neurological symptoms
• Symptoms that are not improving as expected

A clinical assessment can distinguish frozen shoulder from rotator cuff problems, arthritis and other causes of shoulder pain, so the right plan can be put in place early.

How is hydrodilatation considered at Triaxis Sports & Joint Clinic?

At Triaxis Sports & Joint Clinic, hydrodilatation is considered for patients with frozen shoulder following a thorough clinical assessment. Care includes Sports Medicine evaluation, musculoskeletal examination, sports ultrasound where appropriate, a clear discussion of the options, rehabilitation planning and shared decision-making.

Assessment may consider:

• The duration and pattern of symptoms
• Shoulder range of motion
• Functional limitations
• Previous rehabilitation
• Medical conditions such as diabetes
• Relevant imaging
• The full range of management options

Where hydrodilatation is discussed, you will have the chance to understand what the procedure involves, what medication may be used, what the evidence shows, the potential risks, what to expect afterwards and the rehabilitation that supports recovery. The aim always a plan that fits you.

Frequently Asked Questions About Hydrodilatation

Does hydrodilatation help frozen shoulder?

Yes. Hydrodilatation gently expands the tightened shoulder capsule and can improve movement and comfort, with a particular benefit for external rotation. Frozen shoulder also tends to improve over time, and hydrodilatation — combined with rehabilitation — can help you get there more comfortably.

How does hydrodilatation compare with physiotherapy?

They complement one another rather than compete. A 2026 systematic review found that adding hydrodilatation to physical therapy or exercise produced small improvements in pain and disability compared with therapy alone. Rehabilitation remains an important part of the plan, and hydrodilatation supports it.

How does hydrodilatation compare with a cortisone injection?

Hydrodilatation can include corticosteroid while also gently distending the capsule, so it often combines both effects. Recent evidence shows a benefit for external rotation compared with corticosteroid injection alone, with comparable results on other measures. The best choice is tailored to your individual situation.

Does hydrodilatation break the shoulder capsule?

No. Hydrodilatation works by gently distending and stretching the capsule with fluid to create more space and ease movement. It is a controlled, gradual process rather than a forceful “breaking” of tissue.

How many hydrodilatation injections will I need?

This is tailored to the individual. Many patients benefit from a single procedure alongside rehabilitation. Whether a further procedure is helpful depends on your symptoms, movement, previous response and overall plan, and discussed with you.

Can hydrodilatation help me avoid shoulder surgery?

Most patients with frozen shoulder improve without surgery, and hydrodilatation is one of the non-surgical options that can help. Surgery only considered in selected patients whose symptoms and functional limitations persist despite appropriate non-surgical management.

How long should I rest after hydrodilatation?

Aftercare is tailored to you and the medications used. Short-term soreness may occur, and gentle movement and rehabilitation are usually encouraged as part of recovery. You will be given clear, individual instructions to follow, and heavier exercise is guided by your shoulder’s symptoms and function.

Is hydrodilatation safe for people with diabetes?

Hydrodilatation can be considered for people with diabetes, with individual assessment. Because corticosteroid often part of the solution and can temporarily affect blood glucose, your clinician will discuss this with you and advise on monitoring if steroid medication is used.

About the Author

Dr Dinesh Sirisena is a Consultant in Sports, Exercise & Musculoskeletal Medicine. His clinical work includes the assessment and management of sports injuries and musculoskeletal conditions affecting joints, muscles, tendons, ligaments and related structures.

Medical Disclaimer

This page provides general educational information and does not replace individual medical advice. Hydrodilatation not necessary or suitable for every person with frozen shoulder. Decisions about imaging, injections, rehabilitation or other management options should depend on the individual’s symptoms, medical history, clinical findings and treatment goals.

Discover how Prolotherapy can help you recover from chronic pain and injuries. Dr. Dinesh offers expert regenerative treatments in Singapore. Learn more today!