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What is shoulder impingement syndrome?
Subacromial impingement syndrome is the compression (impingement) of the rotator cuff tendons and subacromial bursa between the humeral head and the acromion of the scapula during arm elevation. This is the most common cause of shoulder pain — up to 44-65% of all cases.
Chronic impingement leads to inflammation, degeneration, and eventually — rotator cuff tendon tears. Impingement is the main cause of rotator cuff tears in people over 40 years old.
Stages (Neer classification):
- Stage I — edema and hemorrhage (age <25 years, reversible)
- Stage II — fibrosis and tendinitis (25-40 years)
- Stage III — bone spurs, tendon tears (>40 years)
Causes of impingement:
- Acromion shape — hooked (type III) narrows the space
- Osteophytes — bone spurs on the acromion
- Bursa thickening — chronic inflammation
- Overload — work with arms raised, sports (swimming, tennis)
- Cuff weakness — humeral head shifts upward
Facts about impingement
- ICD-10: M75.1
- Frequency: 44-65% of shoulder pains
- Age: from 25 years
- Complication: rotator cuff tear
- Acromioplasty: 30 000+/year (Germany)
Symptoms of impingement
Typical symptoms
- Pain on arm elevation (60-120° — «painful arc»)
- Night pain when lying on the shoulder
- Weakness with abduction and rotation
- Crepitus with movement
- Pain with internal rotation behind the back
Risk groups
- Swimmers, tennis players, volleyball players
- Painters, plasterers, electricians
- People with slouched posture
- Patients after shoulder injury
Why treatment is important
- Without treatment → rotator cuff tear
- Muscle fatty degeneration is irreversible
- The earlier the treatment — the better the prognosis
- Regenerative treatment prevents tears
Shoulder impingement syndrome: treatment options and what is known about them
The treatment plan is made by the clinic doctor after an examination and a review of your images. The table shows the options usually discussed for this diagnosis and how well they have been studied.
| Option | What to expect | How well studied |
|---|---|---|
| Exercise therapy and physiotherapy | Reduces pain, strengthens muscles, improves function; the basis of treatment | Well studied, recommended |
| Painkillers and NSAIDs | Ease pain during flare-ups; long-term use is limited by side effects | Moderate evidence |
| Corticosteroid injection | Quickly reduces inflammation and pain, the effect is often temporary; frequent injections are undesirable | Moderate evidence |
| PRP / CGF | Concentrate from your own blood; may reduce pain, growth of new tissue has not been shown | Limited or conflicting evidence |
| Arthroscopic subacromial decompression (benefit disputed) | If conservative treatment does not help or there is an indication | When indicated — the doctor decides |
We send your request to several partner clinics. Some will suggest conservative treatment or injections, others surgery; each clinic quotes its own conditions and price. We help you compare the options.
Regenerative methods: realistic expectations
In tendinopathies the basis of treatment is graded loading of the tendon: specific exercises over 3–6 months. Shockwave therapy helps some patients. Evidence on PRP is conflicting: there are studies showing benefit in tennis elbow and plantar fasciitis, but no convincing evidence for other tendons. Corticosteroids relieve pain quickly, but the effect is often short, and repeated injections into a tendon are undesirable.
When surgery is discussed. Surgery is discussed for a complete tendon rupture or if pain persists for more than 6–12 months despite proper treatment.
If an injection helps, the effect usually builds up over 6–12 weeks, and the result is assessed after 2–3 months. No clinic can guarantee a result.
Good to know: diagnosis, self-help, outlook
How to tell shoulder impingement from similar conditions
In subacromial impingement pain occurs when raising the arm sideways or forwards between 60° and 120° (“painful arc”), with overhead movements and at night on the affected side. Arm strength is usually preserved — marked weakness points to a rotator cuff tear. In frozen shoulder all movements are limited, and shoulder osteoarthritis causes grinding and stiffness. Ultrasound and MRI show the tendons, the bursa and the shape of the acromion.
What you can do yourself
For a while reduce overhead work and throwing and avoid sleeping on the painful shoulder. The basis of treatment is exercise for the shoulder-blade and rotator cuff muscles, first without load and then with a resistance band. Watch your posture: slouching narrows the space under the acromion.
Outlook and timelines
Most patients have clearly less pain after 6–12 weeks of exercise. A corticosteroid injection into the subacromial bursa helps through the acute phase. Arthroscopic decompression did not outperform placebo surgery in trials, so it is rarely discussed — only for mechanical causes or a cuff tear.
Who it is not suitable for and possible risks
Contraindications
- Active infection — at the injection site or systemic, with fever.
- Active cancer or ongoing chemotherapy.
- Blood clotting disorders or a low platelet count. Anticoagulants are discussed with the physician.
- Pregnancy and breastfeeding — the procedure is usually postponed.
- A corticosteroid injection into the same area in recent weeks.
- A complete tendon or ligament rupture with loss of function — surgical repair is usually needed.
Possible risks
- Pain and swelling at the injection site for 1–3 days.
- Bruising where blood or fat tissue is taken.
- Rarely, infection. The procedure is therefore performed under sterile conditions with ultrasound or X-ray guidance.
- The effect may be absent or smaller than expected.
If any of these apply to you, mention it in your request. The coordinator will check with the clinic physician whether treatment is possible. Contact a coordinator.
Scientific evidence
Studies of regenerative methods show mixed results. Clinic physicians rely on research including the following:
- Karjalainen TV et al. Surgery for rotator cuff tears. Cochrane Database Syst Rev, 2019.
- Sheth U et al. Efficacy of autologous platelet-rich plasma use for orthopaedic indications: a meta-analysis. J Bone Joint Surg Am, 2012.
Next steps: Treatment methods · Treatment cost · How treatment in Germany is organised
Frequently asked questions about impingement treatment
RegenPAS is a patient service centre in Munich, not a clinic. We review your images and symptoms and send a request to several partner clinics at once. Clinics that can accept you send their own conditions and price; prices differ between clinics, and you choose the option that suits you. The coordinator replies within 24 hours, and a clinic physician’s preliminary opinion follows in 1–3 business days. We then arrange the appointment, visa invitation, interpreter, transfers and accommodation. Treatment decisions are made by the clinic physician. Contact a coordinator.
Your MRI (or CT, X-ray) report and the images if you have them, plus a short description of your symptoms and previous treatment. Send them via the form on the website — the assessment is free and without obligation: the coordinator replies within 24 hours, and the clinic physician’s preliminary opinion follows in 1–3 business days.
The cost depends on the method, the diagnostics needed and the clinic itself: prices differ between clinics. We request offers from several clinics and send you their conditions and quotes so you can compare. Price guidance is on the treatment cost page. For an outpatient procedure, 2–3 days in Munich are usually enough: examination, procedure and follow-up visit.
Clinic and method matching — free of charge
Describe your case and attach your MRI report. We will identify clinics that use the relevant methods and forward your request to them. No obligation; we reply within 24 hours.
Send a request