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Health condition · Clinically reviewed

Calcific tendonitis, the Uhthoff cycle, barbotage and shockwave.

Sudden crescendos of shoulder pain or a grumbling ache with overhead work. A treatable condition with a clear ladder of options.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against BESS, BOA and peer-reviewed shoulder literature you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including ultrasound-guided barbotage and focused shockwave therapy.

Key facts

Calcific tendonitis at a glance.

The essentials, in plain English - what it is, where it hits, and how it’s treated in the UK today.

  • What it is

    Hydroxyapatite calcium crystal deposition within tendon substance, driving acute inflammatory episodes and progressive resorption.

  • Where

    Most commonly the supraspinatus of the rotator cuff (around 80% of cases). Also gluteal, hip, biceps, wrist, elbow, plantar fascia and Achilles.

  • Who

    Women more than men, typically aged 30 to 60. Often bilateral in a proportion of patients.

  • The Uhthoff cycle

    Precalcific, formative, resting, resorptive and post-calcific phases. The resorptive phase is the painful one.

  • First-line

    Ultrasound-guided barbotage (needle irrigation and aspiration) with steroid infiltration is highly effective.

  • When it settles

    The acute resorptive episode is usually self-limiting over weeks. Chronic pain from a formative deposit needs active treatment.

Why this guide matters

A treatable condition with a clear ladder.

Calcific tendonitis feels alarming when it flares but almost always responds to a staged plan. Three principles shape everything below.

  • The phase decides the plan

    An acute resorptive flare is treated for symptom control while nature clears the deposit. A chronic formative deposit calls for active removal.

  • Ultrasound earns its keep

    Ultrasound sizes the deposit, confirms the diagnosis and guides barbotage in the same visit. It is the workhorse investigation.

  • Surgery is the last step, not the first

    Most patients settle with conservative care, barbotage or shockwave. Arthroscopic surgery is reserved for genuinely refractory cases.

How the diagnosis is made

From the first ache to a clear plan.

The steps a UK shoulder specialist will normally follow - so you know what to expect and why.

  1. 01

    Assessing

    Clinical history and pattern

    A structured account of onset - was it a sudden overnight crescendo of pain (resorptive) or a grumbling ache with activity (formative)?

  2. 02

    Assessing

    Shoulder examination

    Range of movement, painful arc, impingement signs and rotator cuff strength. In acute episodes, movement is often guarded and minimal.

  3. 03

    Assessing

    Rule out mimics

    Septic arthritis, gout, frozen shoulder and rotator cuff tear can all present similarly. In acute episodes, fever and raised inflammatory markers may be present.

  4. 04

    Confirming

    Plain X-ray

    Shows the calcification. Graded by Gärtner or French Society (I to III) based on density and border definition.

  5. 05

    Confirming

    Diagnostic ultrasound

    Hyperechoic focus with acoustic shadowing. Confirms the diagnosis, sizes the deposit and guides intervention on the same visit.

  6. 06

    Planning

    MRI where diagnosis unclear

    Assesses surrounding oedema, tendon integrity and helps differentiate from a tear or other pathology when clinical picture is atypical.

  7. 07

    Planning

    Plan a treatment ladder

    Conservative first, then barbotage or shockwave, with surgery reserved for refractory disease. Physiotherapy runs through the whole plan.

Typical timeline: first specialist review to a working plan, in a single visit where imaging is available on the day.

Symptoms

What calcific tendonitis actually feels like.

Two very different pictures - the excruciating resorptive flare and the chronic formative ache - plus features that mean it’s time to escalate.

  • Sudden severe shoulder pain

    The classic acute resorptive episode - excruciating, often overnight, sometimes described as worse than childbirth or a fracture.

  • Guarded, minimal range

    The arm is held close to the body. Even small movements provoke pain and patients often present unable to lift the arm.

  • Local swelling and warmth

    Inflammation can spill into the subacromial bursa producing local swelling. Occasionally low-grade fever and raised CRP mimic infection.

  • Chronic dull ache with activity

    Formative-phase pain - a grumbling shoulder that hurts with overhead work, reaching behind the back or lying on the shoulder at night.

  • Painful arc and impingement

    Pain between roughly 60 and 120 degrees of abduction as the calcified tendon catches under the acromion.

  • Hip, gluteal or biceps pain

    Non-shoulder sites present as focal tender points with activity-related pain. The pattern and imaging still fit the same disease.

  • Referred pain down the arm

    Pain often radiates into the deltoid insertion, occasionally to the elbow. Rarely radiates below the elbow, which would suggest a cervical cause.

  • Red flag - mimicking sepsis

    A resorptive shoulder with fever and raised markers can look like septic arthritis. Imaging is what tells the two apart.

Treatment

How calcific tendonitis is treated in the UK.

Conservative first, then ultrasound-guided barbotage or focused shockwave, with subacromial injection or arthroscopic surgery for selected cases.

  • NSAIDs and activity modification

    First-line for pain in both acute and chronic phases - short courses of ibuprofen or naproxen with gastric protection where appropriate.

  • Physiotherapy

    Range-of-movement work, rotator cuff and scapular strengthening, eccentric loading and graded return to activity. Runs throughout treatment.

  • Ultrasound-guided barbotage

    Needle irrigation, aspiration and lavage of the deposit with a steroid infiltrate. Highly effective first-line procedure for a formative deposit.

  • Extracorporeal shockwave (ESWT)

    High-energy focused shockwave sessions - evidence-based for chronic calcific tendinopathy over six months. No injection needed.

  • Subacromial steroid injection

    Reduces bursal inflammation and settles pain quickly. Doesn’t dissolve the deposit itself but is very useful for symptom control.

  • Acute resorptive episode care

    Usually self-limiting over weeks. Strong analgesia, a sling for comfort and, selectively, an intra-articular or bursal steroid for severe pain.

  • Arthroscopic needling and excision

    Keyhole surgery to remove the deposit, with subacromial decompression as indicated. Reserved for disease that hasn’t responded to conservative and injection therapy.

  • PRP and biological options

    Platelet-rich plasma is sometimes used in chronic tendinopathy. Evidence in calcific disease specifically is more limited and case-selected.

What this guide is based on

The sources behind every claim on this page.

UK society guidance and peer-reviewed shoulder literature, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, physiotherapist or shoulder specialist knows your history and imaging and can tell you which parts apply to you. If in doubt, get seen.

  • British Elbow and Shoulder Society (BESS). Rotator cuff and calcific tendinopathy patient information.

  • British Orthopaedic Association (BOA). Standards for shoulder assessment and referral.

  • NICE Clinical Knowledge Summaries. Shoulder pain.

  • Uhthoff HK, Loehr JW. Calcifying tendinitis: pathogenesis, diagnosis and management. Journal of the American Academy of Orthopaedic Surgeons.

  • European Society of Musculoskeletal Radiology. Guidance on ultrasound-guided barbotage.

Red flags

When shoulder pain needs urgent attention.

Most calcific tendonitis is manageable. These are the situations that need a specialist opinion sooner rather than later.

  • Fever and systemic upset

    A hot, swollen, painful shoulder with fever needs to be assessed for septic arthritis before assuming a resorptive episode.

  • History of trauma with weakness

    Sudden loss of shoulder function after a fall or lifting injury raises the possibility of an acute rotator cuff tear needing urgent imaging.

  • Neurological signs

    Numbness, arm weakness or pain radiating below the elbow suggests a cervical spine or brachial plexus problem, not a tendon deposit.

  • Diabetes and repeated steroid use

    Steroid injections need care in diabetes and shouldn’t be repeated indiscriminately - they can weaken tendon tissue over time.

  • Refractory pain beyond three months

    Persistent, disabling pain despite first-line measures deserves early specialist review, imaging update and consideration of barbotage or shockwave.

  • Frozen shoulder overlap

    A stiff, globally restricted shoulder after a calcific episode may have developed secondary adhesive capsulitis needing a different treatment plan.

  • Bilateral or multi-site disease

    Extensive or multi-site calcific disease occasionally warrants a metabolic screen to exclude an underlying deposition disorder.

  • Pregnancy

    Imaging and treatment choices need to be tailored - many oral and injected options are restricted, and physiotherapy takes on a bigger role.

  • Unclear diagnosis on imaging

    Where X-ray and ultrasound don’t match the clinical picture, MRI helps sort tendon tear from calcific tendinopathy from other pathology.

Living with it

A treatable shoulder, a clear plan.

Four things that make the biggest difference day to day - pacing the flare, keeping the shoulder moving, sticking with rehab and knowing when to step up.

A quiet reminder

Movement is medicine, in careful doses.

Total rest of a painful shoulder leads to secondary stiffness. Small, frequent, pain-limited movements protect the joint while the tendon settles.

  1. 01 Pace

    Pace the acute phase

    A resorptive episode is short and severe - strong analgesia, a sling for comfort and letting the phase pass are usually the right call.

  2. 02 Move

    Keep the shoulder moving

    Even in the painful phase, gentle pendulum swings and small-range movement prevent secondary stiffness and frozen shoulder.

  3. 03 Rehab

    Rehab is the through-line

    Rotator cuff and scapular strengthening under a physiotherapist is what protects the shoulder long-term, whatever intervention you have.

  4. 04 Escalate

    Don’t sit on a formative deposit

    If pain grumbles on for weeks with a visible deposit on imaging, ultrasound-guided barbotage or shockwave is often the shortcut back to normal.

Frequently asked

Everything we get asked about calcific tendonitis.

Quick answers on the Uhthoff cycle, barbotage, shockwave and when surgery is warranted.

  • What is calcific tendonitis?

    It’s a condition in which crystals of calcium hydroxyapatite are deposited within tendon substance, most often the supraspinatus of the rotator cuff. It causes both a chronic aching pain from the deposit itself and, at times, an acute severe pain when the body starts to resorb the crystals.

  • Why is the pain so severe in the acute episode?

    The acute episode reflects the resorptive phase of the Uhthoff cycle - inflammatory cells break down the calcium deposit and this generates intense local inflammation, swelling and pressure inside the tendon. It can be excruciating and, alongside fever and raised inflammatory markers, occasionally mimics a septic joint.

  • How is it diagnosed?

    Clinical assessment plus imaging. A plain X-ray usually shows the calcification and lets it be graded (Gärtner or French Society I to III). Ultrasound confirms the diagnosis, sizes the deposit and guides treatment. MRI is reserved for atypical cases or where tendon integrity is in doubt.

  • What is ultrasound-guided barbotage?

    A minimally invasive procedure done under local anaesthetic and ultrasound guidance. A fine needle is passed into the calcium deposit, saline is used to lavage and aspirate as much of it as possible, and a small dose of steroid is injected around the tendon to settle inflammation. It’s a highly effective first-line option for a formative deposit.

  • Does shockwave therapy actually work?

    Yes - focused high-energy extracorporeal shockwave therapy (ESWT) has good evidence for chronic calcific tendinopathy that has been present for more than six months. It’s usually delivered as a short course of sessions and can be a good alternative for patients who prefer to avoid a needle.

  • When is surgery needed?

    Surgery is reserved for refractory disease - persistent pain and function loss despite conservative treatment, barbotage or shockwave. The usual operation is arthroscopic needling and excision of the deposit, sometimes with subacromial decompression. Most patients do not need surgery.

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