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Shoulder hydrodilatation London.

Ultrasound-guided distension of the shoulder joint for adhesive capsulitis. A 20-minute day-case treatment, done awake under local anaesthetic, from £800 across our vetted London network.

Ultrasound-guided shoulder injection at a London day-case clinic

What it is

An ultrasound-guided injection that stretches the shoulder capsule open.

Hydrodilatation, also called capsular distension, injects a large volume of sterile saline mixed with a corticosteroid and local anaesthetic directly into the glenohumeral joint. The fluid distends the joint capsule until it reaches its stretch limit, disrupting the adhesions that make a frozen shoulder painful and stiff. The steroid calms the inflammatory drive, the local anaesthetic buys immediate relief on the day, and ultrasound guidance confirms the needle is in the joint rather than around it.

When it helps

Who benefits from hydrodilatation.

  • Adhesive capsulitis (frozen shoulder)

    The core indication. Works across the freezing, frozen and thawing stages, with the best return on effort in the frozen and early thawing phases when pain and stiffness are entrenched.

  • Failed conservative treatment

    Symptoms persisting despite 6 to 12 weeks of physiotherapy, oral anti-inflammatories or a plain steroid injection. Hydrodilatation adds mechanical distension to a straightforward intra-articular injection.

  • Diabetic frozen shoulder

    Diabetes is the strongest risk factor for adhesive capsulitis and for a stubborn course. Hydrodilatation is well tolerated; blood glucose is monitored for a few days as the steroid can push readings up.

  • Post-immobilisation stiffness

    Secondary capsulitis after a fracture, rotator cuff repair or prolonged sling use, where the joint capsule has contracted and physiotherapy alone is not restoring range.

The procedure

Twenty minutes, awake, done.

You are seated or lie on the unaffected side. The consultant marks a posterior approach into the glenohumeral joint under ultrasound and cleans the skin. Local anaesthetic is infiltrated at the entry point, then a fine spinal needle is advanced under real-time ultrasound until its tip sits inside the joint capsule.

Fluid is instilled slowly, most commonly a mixture of sterile saline, a corticosteroid such as triamcinolone or methylprednisolone, and a long-acting local anaesthetic. The total volume is gradually built up, typically to around 40 mL, until the capsule reaches its stretch limit. You feel the shoulder fill with pressure; the consultant stops the moment resistance signals the capsule is at its limit.

The whole appointment takes about 20 minutes. There is no sedation, no fasting, and no dressing beyond a small plaster.

What to expect

Efficacy, honestly.

Around 60 to 70 per cent of patients report meaningful pain improvement at 6 to 12 weeks, and useful gains in range of movement that continue to build over the following months. Hydrodilatation is not a cure on its own. Structured physiotherapy in the 4 to 6 weeks after the injection is what turns pain relief into lasting movement. A small number of patients need a second injection at three months; a smaller number progress to manipulation under anaesthetic or arthroscopic capsular release.

Where it is done

A small London panel we vetted ourselves.

  • HCA Wellington MSK Radiology
  • Cromwell Hospital (BUPA)
  • London Orthopaedic Clinic
  • The Bunhill Clinic
  • London Sports Injury Clinic

Recovery

The work is in the physio.

Most patients notice an immediate reduction in pain as the local anaesthetic takes effect, and can drive home. Ordinary daily activities resume the same day. The shoulder often feels heavy or full for 24 to 48 hours; simple analgesia and an ice pack are enough.

Structured physiotherapy should start within a week and continue for 4 to 6 weeks. This is not optional. The injection buys a window of comfort and mechanical slack in the capsule; physiotherapy is what turns that window into durable range of movement. Patients with diabetes should monitor blood glucose for 3 to 5 days as the steroid can transiently raise readings.

FAQs

Common questions.

  • What is shoulder hydrodilatation?

    An ultrasound-guided injection into the glenohumeral joint of saline mixed with a corticosteroid and local anaesthetic. The fluid volume distends the joint capsule until its stretch limit, disrupting the adhesions that cause a frozen shoulder. Steroid calms the inflammation, local anaesthetic manages pain on the day.

  • How effective is it?

    Around 60 to 70 per cent of patients report meaningful pain improvement at 6 to 12 weeks, with gains in range of movement that build over the following months. Results are strongest when combined with a structured physiotherapy programme in the 4 to 6 weeks after.

  • How long does the procedure take?

    About 20 minutes in total. You are awake throughout, lying on your side or seated. Local anaesthetic is used at the skin, then the consultant advances a fine needle under ultrasound guidance and slowly instils fluid until the capsule reaches its stretch limit, typically up to 40 mL total volume.

  • Does it hurt?

    The local anaesthetic sting is the sharpest part. As the capsule fills you feel a growing pressure or ache in the shoulder, which fades within an hour as the local anaesthetic takes effect. Most people leave the clinic already more comfortable than when they arrived.

  • How much does it cost privately in London?

    Expect £800 to £1,600 for an ultrasound-guided shoulder hydrodilatation at a London day-case clinic, inclusive of consultant time, ultrasound and consumables. A follow-up consultation and physiotherapy plan are usually charged separately.

  • What happens after the injection?

    You go home the same day, drive yourself if you wish, and resume ordinary daily activities immediately. Physiotherapy should start within the first week and continue for 4 to 6 weeks to consolidate the gain in range of movement.

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