Subscapularis tendinopathy

Anatomy: Role of the subscapularis in the rotator cuff

The subscapularis muscle arises from the front surface of the shoulder blade (subscapular fossa) and attaches with its tendon to the small humerus (tuberculum lesser) and along the crista. Together with the supraspinatus, infraspinatus and teres minor, it forms the rotator cuff. In addition to internal rotation, it centers the humeral head in the socket and stabilizes the front shoulder.

• Function: Internal rotation and anterior stabilization of the shoulder joint
• Tendon structure: upper and lower parts, interlocking with capsule
• Neighborhood: long biceps tendon (pulley system), coracoid (coracoid process), subcoracoid space

The proximity to the long biceps tendon explains why pulley lesions (stabilizers of the biceps tendon) and subscapularis damage often occur together.

Causes and risk factors

Tendinopathy is caused by an imbalance between the load and resilience of the tendon. Microtrauma, lack of recovery and degenerative changes interact.

• Overhead and throwing loads (swimming, tennis, handball, CrossFit)
• Repeated internal rotation under load (e.g. assembly line work, assembly)
• Subcoracoid impingement: Tightness between the upper arm and the coracoid process
• Pulley lesions of the biceps tendon with anterior shoulder instability
• Age-related degeneration of the rotator cuff
• Smoking and metabolic factors (e.g. diabetes) act as an obstacle to healing
• Acute trauma caused by forced external rotation/abduction of the shoulder

Rarely, calcification in the tendon (tendinosis calcarea) may be involved. Technical errors in training and rapid increases in load increase the risk even further.

Symptoms: How do I recognize subscapular tendinopathy?

• Front shoulder pain, often stabbing or dull
• Pain with internal rotation and when reaching behind the back (close pants, open bra)
• Pain/loss of strength when holding objects close to the body
• Night pain when lying on the affected side
• Stress-dependent complaints, possibly clicking or snapping phenomena if the biceps are involved

In the case of larger (partial) tears, specific functional failures can occur: positive lift-off, belly press or bear hug test.

Diagnosis: Examination and imaging

Diagnosis is based on history, physical examination, and judicious use of imaging. It is important to precisely analyze pain provocation, strength and movement quality.

• Clinical tests: lift-off, belly press, bear hug (subscapularis), speed/yergason (biceps), impingement tests
• Inspection of the scapular guide (scapula dyskinesis), cervical spine and AC joint screening
• Ultrasound: dynamic assessment of the tendon, lubrication, fluid, partial ruptures
• X-ray: accompanying bony changes, calcifications, joint space
• MRI/MR arthrography: detailed tendon assessment, pulley and biceps involvement, subcoracoid space

Not every structural abnormality causes symptoms. Findings are always placed in the clinical context.

Conservative therapy: The standard for tendinopathy

The aim is to reduce pain, restore function and make the tendon resilient. As a rule, gradual conservative treatment is sufficient.

The training stimulus should be demanding, but not overwhelming: short-term, mild pain (up to 3/10) is tolerable, persistent after-pain >24 hours indicates that the intensity is too high.

Physiotherapy and exercises: build up safely

• Isometric internal rotation: elbows along the body, hand pressed against the wall/towel (5×10–20 seconds, 1–2×/day).
• Belly press isometric: hand on stomach, keep light pressure, shoulder blade stable.
• Theraband internal rotation in neutral position: 3×12–15 reps, slow eccentricity.
• Closed chain exercises: wall slides, plank variations with a focus on serratus/lower trapezius.
• External rotators and scapula co-contraction: Compensation creates cuff balance.
• Stretching of the posterior capsule (cross-body stretch) and chest muscles, provided pain-free.

Progression: Increase through resistance, range of motion, repetitions or complexity - usually every 1-2 weeks, depending on tolerance.

Injections and regenerative procedures: When does it make sense?

If the symptoms do not subside sufficiently after structured conservative therapy over a period of weeks, additional measures can be considered. The selection and timing are made individually and after informed consent.

• Ultrasound-targeted injection into the subcoracoid space or near tendon insertion: a low-dose corticosteroid can provide short-term pain relief and improve exercise ability.
• PRP (platelet-rich plasma): discussed as an individual health service for chronic tendinopathy; Evidence mixed, benefit not certain.
• Hyaluronic acid peritendinous: controversial for shoulder tendons; routine use not recommended.
• Calcifications: if necessary, ultrasound-targeted needling/lavage (“needling/barbotage”) for symptomatic calcified shoulder.

Repeated cortisone injections should be avoided to avoid weakening tendon tissue. The goal remains active function development.

Surgery: Indication for tear or treatment-resistant complaint

Surgery is particularly considered in the case of severe partial or complete lesions of the subscapularis tendon, significant functional deficit and failure of conservative therapy.

• Arthroscopic tendon suture at the lesser tubercle, if necessary with anchors.
• Treatment of accompanying pulley/biceps lesions (tenodesis or tenotomy).
• In the case of subcoracoid impingement: if necessary, subtle coracoplasty to enlarge the space.

Follow-up treatment: initial immobilization in a sling, early functional passive/assistive mobilization, gradual strength building from weeks 6-12 according to the protocol. Return to sport is individual, often after 4-6 months – depending on the size of the defect and the quality of the tissue.

Course and prognosis

Many patients benefit from structured, conservative therapy in 6–12 weeks. It takes time to fully build up the load on the tendon: improvements often continue over several months.

• Good prospects with early load management and a consistent exercise program.
• Risk factors for a longer course: advanced degeneration, metabolic diseases, persistent overhead strain.
• The aim is to control symptoms and gain functionality - absolute freedom from pain under maximum load can vary.

Self-management and prevention

• Load control: Load increases in training a maximum of 10% per week.
• Warm-up: 10-15 minutes general + shoulder girdle specific.
• Technique training: clean pulling/pushing patterns, shoulder blade control.
• Ergonomics: Elbows close to the body, distribute loads over several trains.
• Sleep: lie on your back or healthy side, do not clamp your arm over your head.
• Reduce/give up smoking and adjust your metabolism well – supports healing.

Differential diagnoses

• Biceps tendonitis or dislocation (pulley-related)
• Supraspinatus or infraspinatus tendinopathy
• Rotator cuff partial/complete tear
• Subcoracoid or subacromial impingement
• Adhesive capsulitis (frozen shoulder)
• AC joint osteoarthritis
• Cervical radiculopathy with radiating shoulder pain

When should I seek medical advice?

• Acute trauma with persistent weakness or loss of function
• Severe night pain for weeks
• Feeling of instability, “snapping” in the front of the shoulder
• Numbness, tingling or radiating pain in the arm
• No improvement despite taking independent measures after 2-4 weeks

In our practice at Dorotheenstrasse 48, 22301 Hamburg, we clarify rotator cuff complaints in a structured manner and plan the therapy together with you.

Aftercare and rehabilitation: milestones

The specific plan depends on the findings, everyday life and goals. Regular re-checks ensure the optimal dose.

Common Mistakes and Myths

• “Only rest will the tendon heal”: A measured, progressive load is important for tissue adaptation.
• “Pain means damage”: Mild training pain is acceptable; What matters is the overall reaction.
• “Cortisone solves the problem”: It can provide temporary relief, but it is not a replacement for an active program.
• “Surgery is always necessary”: Rare for tendinopathies – first try conservative options.