Ligamentous capsular instabilities of the shoulder

What are ligamentous capsular instabilities of the shoulder?

The shoulder is the most mobile ball joint in the body. Stability is created primarily by the capsular ligament apparatus, the articular lip (labrum), the rotator cuff and the muscular control of the shoulder blades. In the case of ligamentous capsule instabilities (glenohumeral instability), the ligaments and the capsule are overstretched, worn out or torn. This can cause the head of the humerus to have too much play in the socket - which can lead to repeated dislocations.

• Anteroinferior instability: often after dislocation in abduction/external rotation position, often with Bankart lesion (labral capsule tear).
• Posterior instability: less common; more typical when falling forward, cramps or pressure in internal rotation (e.g. bench press).
• Multidirectional instability (MDI): Hypermobility in multiple directions, often atraumatic with generalized connective tissue laxity.

Anatomy: capsular ligament apparatus and stability

The shoulder capsular-ligamentous apparatus consists of a thin but important joint capsule and several ligaments. These passive structures limit the final extent of movement and guide the humeral head into the socket. They work closely with the labrum, rotator cuff and scapulothoracic muscles.

• Superius glenohumeral ligament (SGHL): stability near zero position, limits anterior translation.
• Medium glenohumeral ligament (MGHL): limits anterior translation in medium abduction angles.
• Lig. glenohumerale inferior (IGHL complex): most important stabilizer in abduction/external rotation; anterior and posterior ligament plus axillary recess.
• Labrum glenoidale: fibrocartilaginous articular lip, deepens the socket and serves as an attachment structure for capsule and ligaments.

In cases of instability, the capsule and labrum are often affected together. Bony defects (e.g. Hill-Sachs impression on the humeral head, bony Bankart lesion on the socket) can also exacerbate the situation.

Causes and risk factors

• Traumatic: initial dislocation due to fall or contact with abduction/external rotation; often labrum/capsule tear (Bankart).
• Microtraumatic: Repeated overhead work or sports (throwing, volleyball, swimming) with gradual capsular overstretching.
• Atraumatic/hypermobile: Generalized connective tissue laxity, e.g. B. increased hypermobility (Beighton score).
• Job/Sport: Overhead loads, contact and throwing sports, weight training with large loads in end positions.
• Previous operations or previous dislocations with residual laxity.
• Neuromuscular imbalance: inadequate scapular control, weak rotator cuff.

Symptoms and typical complaints

• Feeling of unsteadiness or folding away, especially during abduction/external rotation (putting on jacket, overhead movements).
• Feeling of fear/defensiveness (apprehension) in certain positions.
• Repeated subluxations or dislocations, sometimes self-reducing.
• Pain in the front or deep in the joint, often dependent on the load and position.
• Loss of strength, throwing pain, “dead arm” feeling during sports.
• Snapping/cracking, tension in the surrounding muscles.
• Nocturnal discomfort, especially when lying on the affected side.

When should I go to the practice for an clarification?

• After a first or repeated shoulder dislocation.
• If there is a persistent feeling of insecurity and loss of function despite protection.
• For repeated subluxations or snapping events.
• If you experience numbness, tingling or significant loss of strength.
• After trauma with visible deformity, massive swelling or pronounced pain.

Diagnostics in our practice

We combine a structured anamnesis with targeted clinical tests and imaging diagnostics. It is crucial to understand the direction, extent and triggers of the instability while simultaneously ruling out accompanying injuries.

• History: initial event, recurrences, sport/work profile, painful positions, feeling of instability.
• Clinical tests: Apprehension and relocation test, load and shift, sulcus sign, posterior shift, jerk test; Scapula assessment.
• Hypermobility: guiding Beighton score and family/systemic indications.
• Imaging: X-ray to rule out bony injuries and assess defects; Ultrasound to assess rotator cuff and effusion.
• MRI/MR arthrography: highly sensitive for labral/capsular injuries, capsular laxity and associated pathologies (e.g. SLAP lesions).

Differential diagnoses include, among others: Rotator cuff lesions, subacromial impingement, biceps tendon disorders and neurological causes. The distinction is important because therapy management is different.

Conservative therapy – the standard first

The vast majority of atraumatic or functional instabilities benefit from a consistent, multi-stage rehabilitation program. The aim is to restore dynamic stability through muscle strength, coordination and proprioception - individually tailored to everyday life and sport.

• Taping/orthosis: can provide support during the construction phase; does not replace training.
• Work/everyday coaching: reducing overhead time, planning breaks and technology.
• Time required: often 3–6 months until stable functional improvement occurs; Patience and regularity are key.

Intra-articular cortisone injections can temporarily reduce pain in the event of inflammatory irritation, but do not change laxity. We use such measures cautiously and only with clear indications.

Injections and regenerative procedures: what makes sense?

For the specific “tightening” of a lax capsular ligament apparatus, there is currently no reliable evidence for regenerative procedures (e.g. PRP, prolotherapy) that justifies routine use. In individual cases, pain-relieving measures can be discussed - always with transparent information about benefits, limits and alternatives.

• PRP/Hyaluron: not established for the treatment of structural capsular laxity of the shoulder.
• Thermal capsular shrinkage: described historically, but mostly not recommended today due to unpredictable results and recurrence rates.
• The focus remains on a structured, progressive stabilization program.

Surgical options – when and how?

Surgery is considered if clinically relevant instability persists despite consistent, specialist-led rehabilitation, in the case of repeated dislocations, in the case of significant structural injuries (e.g. Bankart, relevant bony defects) or in the event of high sporting/occupational demands with failure of conservative therapy.

• Arthroscopic Bankart repair with capsule tightening (plication): reattachment of the labrum and tightening of the anterior/inferior capsule.
• Posterior repair/plication: for posterior instability.
• Remplissage: Additional procedure for “engaging” Hill-Sachs defects.
• Bone procedure (e.g. Latarjet): in cases of significant glenoid edge deficiency.
• Accompanying treatment of SLAP/biceps pathologies depending on the findings.

Rehabilitation after surgery is protocol-based: initial immobilization in a sling, early passive mobilization in a safe area, then active strengthening and sports development. Depending on the procedure and course, returning to contact sports can take several months (often 4-6 months, overhead sports 6-9 months).

Every procedure has risks (e.g. renewed instability, stiffness, nerve irritation, infection). We discuss benefits, alternatives and possible complications individually. A specific result cannot be guaranteed.

Course, prognosis and risk of relapse

The prognosis depends on the cause, direction of instability, tissue quality, sporting stress and the consequences of therapy. Many patients improve significantly through targeted physiotherapy and achieve stable functionality. In the case of structural lesions, surgical stabilization may be useful.

• Better with: good scapula control, consistent training, realistic load management.
• Challenging for: repeated dislocations, bony defects, high overhead load, generalized hypermobility.
• The risk of relapse decreases with adequate rehabilitation and technique/load adjustment, but remains dependent on the sport and tissue.

Prevention, everyday life and sport

• Warm up and progressively increase the load, especially before overhead activities.
• Regularly integrate scapula setting and rotator cuff exercises.
• Slowly re-work provocative end positions; Don’t train “into the pain zone”.
• Ergonomic adjustments at work, planning breaks for overhead work.
• Technical training in throwing/strength sports; Controlled ranges of movement in strength training (e.g. bench press not extremely deep).
• Early clarification if you feel insecure instead of “continuing to train despite folding away”.

Connection to rotator cuff and biceps tendon

Instabilities often put strain on the rotator cuff and the long biceps tendon. Pain or tendon irritation can be the result of the additional work of the dynamic stabilizers. A differentiated assessment helps to treat accompanying pathologies and to structure the rehabilitation sensibly.

• Rotator cuff tendinopathies (supraspinatus, infraspinatus, subscapularis, teres minor) as a concomitant or differential diagnosis.
• Partial or torn rotator cuffs can further reduce the feeling of stability.
• Biceps tendonitis (LBS) and SLAP-associated symptoms are not uncommon in instability patterns.
• Subacromial impingement can be promoted by altered biomechanics.

Your shoulder specialists in Hamburg-Winterhude

In our orthopedic practice at Dorotheenstrasse 48, 22301 Hamburg, you will receive careful diagnostics and individual, evidence-based therapy planning. Our focus is on conservative strategies; If necessary, operational options are discussed neutrally and transparently. You can easily request appointments online or by email.