Inferior shoulder dislocation (luxatio erecta)

Shoulder anatomy and stability principles

The shoulder is the most mobile joint in the body. The round head of the upper arm (humeral head) moves in the relatively flat socket of the shoulder blade (glenoid). Stability arises from the interaction of passive structures (capsule, ligaments, labrum) and active stabilizers (muscles). Important nerve and vascular structures run directly behind and below the joint, such as the axillary nerve and the axillary artery.

• Passive stabilizers: joint capsule, glenohumeral ligaments, labrum (cartilage lip).
• Active stabilizers: rotator cuff (supraspinatus, infraspinatus, subscapularis, teres minor) and scapular stabilizers.
• Structures at risk in the event of dislocation: axillary nerve (sensory disturbance over the outside of the upper arm), brachial plexus, axillary vessels, greater/minor tuberosity, glenoid rim.

What is an inferior shoulder dislocation?

In inferior shoulder dislocation (luxatio erecta), the humeral head slips downward under the acromion. A forced posture with a strongly abducted arm, which often cannot be lowered, is characteristic. This form only accounts for a small proportion of shoulder dislocations and is significantly different from the more common anterior (forward) and posterior (backward) dislocations.

• Rare form of dislocation: the head of the humerus is positioned inferiorly (downwards).
• Typical arm position: abduction/overhead position, severe pain, movement block.
• High risk of nerve and vascular involvement compared to other directions of dislocation.

Causes, mechanisms and risk factors

The trigger is usually a hyperabduction mechanism: the arm is suddenly pushed over the head or forced into strong abduction by external forces. The humeral head is levered downwards out of the socket. Seizures or direct trauma are less common causes.

• Falling with your arm fixed to the railing, branch or handle (overhead force).
• Work or sports accidents involving forced abduction (e.g. climbing, contact sports, falling from a bike).
• Accompanying factors: connective tissue laxity, muscular imbalance, older age (degenerative tendons).
• Previous injuries to the shoulder (e.g. tears in the rotator cuff) increase the risk of secondary injuries.

Symptoms and warning signs

Those affected report a sudden, stabbing pain with immediate restriction of movement. The shoulder appears deformed and the arm is in a characteristic abducted or overhead position. Numbness or tingling may indicate nerve involvement.

• Severe pain, deformed contour of the shoulder.
• Forced posture: arm above head or in clear abduction, active lowering is hardly possible.
• Sensory disturbances on the outside of the upper arm, weakness when lifting (indication of axillary nerve involvement).
• Cold, pale hand, weakened pulse (possible vascular involvement).

First aid and emergency information

An inferior shoulder dislocation belongs in the hands of a doctor. Please do not attempt self-reduction. Carefully stabilize the arm in the assumed position, cool the shoulder from the outside and remove rings/watches from the affected hand.

• No jerky pulling or “adjusting” on your own.
• Stabilize the arm in the current position with a pillow/scarf and see a doctor quickly (emergency room).
• Do not eat/drink anything before possible sedation.
• Repeatedly check the blood circulation, motor function and sensitivity of the hand (immediately call 112 if the condition worsens).

Diagnostics: clinical examination and imaging

After the initial admission, the clinical examination is carried out with particular attention to the nerve and vascular status. X-rays confirm the diagnosis and show the direction of dislocation as well as accompanying bony injuries. After the reduction, another x-ray is taken to confirm the correct position.

• X-ray (AP, Y/outlet image), if necessary additional axillary projection after reduction.
• Ultrasound: assessment of rotator cuff, effusion/hematoma.
• CT: detailed fracture diagnosis (greater/minor tuberosity, glenoid rim).
• MRI (usually after reduction and swelling): assessment of the capsular-labrum complex, rotator cuff, soft tissues.

Frequent accompanying injuries with luxatio erecta

Compared to other dislocations, accompanying injuries to nerves, vessels, tendons and bones are more common in inferior dislocations. Careful recording is crucial for therapy planning and prognosis.

• Nerve injuries: v. a. Axillary nerve, parts of the brachial plexus (numbness, deltoid weakness).
• Vascular involvement: injury/compression of the axillary artery (circulatory disorder of the hand).
• Tendons: Single or multiple tendon tears of the rotator cuff, especially in older patients.
• Bones: separation of the greater tuberosity, glenoid rim fractures, impressions on the humeral head.
• Capsular labral lesions: capsular tears, labral injuries, interposed soft tissues.

Acute therapy: gentle reduction and stabilization

The reduction (return of the humeral head) is usually carried out promptly in the emergency room under analgesic sedation. Various gentle techniques are available; The aim is a low-stress, controlled return without additional damage. After successful reduction, the shoulder is briefly immobilized and the neurovascular status is checked again.

• Quick, pain-adapted reduction by experienced staff.
• Postreposition X-ray to check the position.
• Application of an arm sling/abduction cushion depending on the findings, ice, elevation.
• Early orthopedic follow-up to determine further action.

Conservative therapy and aftercare

If the situation is stable without a relevant fracture or fixed soft tissue interposition, conservative treatment is in accordance with the guidelines. It combines short-term immobilization, sufficient pain therapy and structured physiotherapy with a slow increase in stress.

• Immobilization: usually 1–3 weeks in neutral adduction; Duration depends on age, accompanying findings and pain.
• Pain management: cooling, anti-inflammatory medication according to individual tolerance, local measures if necessary.
• Physiotherapy: Start with passive/assistive movements, scapula setting and isometric exercises.
• Initial movement limits: no forced abduction/exorotation above pain threshold; gradual release.
• Everyday life: shoulder-conscious ergonomics, no heavy lifting/overhead work in the early phase.

Surgical therapy: clear indications

Operations are not the rule for inferior dislocations, but are useful for certain conditions. The decisive factors are structural damage that cannot be treated conservatively in a sufficiently stable manner or impending complications.

• Entrapment of capsule/labrum or soft tissues preventing stable reduction.
• Relevant bony injuries (e.g. displaced greater tuberosity fracture, unstable glenoid rim).
• Severe tendon tears of the rotator cuff with loss of function.
• Persistent neurovascular impairment (interdisciplinary with vascular surgery/neurosurgery).
• Arthroscopic or open procedures depending on findings; Decision based on imaging and functional status.

We discuss opportunities, risks and alternatives transparently. There is no promise of healing; The aim is to provide safe, function-oriented care with a return to everyday life and sport as quickly as possible.

Rehabilitation and time frame

The follow-up treatment is crucial for the result. The plan is individually adapted to age, profession, sport and accompanying injuries. Quality comes before haste: too early strain can delay healing, too long rest promotes stiffness.

• Office work is often possible after 1-2 weeks (close to the arm, ergonomic).
• Driving a vehicle only when you have sufficient control without pain.
• Overhead sports can take 3-6 months, depending on the findings and training status.

Course, prognosis and risk of relapse

With professional acute care and consistent rehabilitation, the prognosis is good in many cases. Pain and uncertainty decrease over time and mobility improves. The risk of a new inferior dislocation is considered to be lower overall than with the common anterior dislocation, but depends on age, tissue quality and concomitant injuries.

• Possible short-term consequences: bruising, irritation of tendons, temporary numbness.
• Possible medium-term risks: frozen shoulder (especially >50 years), persistent muscle weakness without targeted exercise.
• Rare: chronic instability; then further clarification and, if necessary, a stabilization concept.

Prevention and safe re-entry

After a dislocation, a structured prevention program makes sense. The aim is to improve strength, coordination and movement control in order to avoid uncontrolled extreme movements.

• Strengthening the rotator cuff and scapular stabilizers, focusing on external/internal rotation balance.
• Coordination/proprioception: closed chain, unstable surfaces, sport-specific drills.
• Ergonomics/workplace: dosing overhead load, breaks, technology training.
• Sport: technique check, gradual increase in intensity, adequate regeneration.

Special aspects: age, sport, comorbidities

Not every shoulder is the same: age, muscle status and previous illnesses influence therapy and healing. We take this into account in the individual plan.

• Older patients: more frequent tendon tears and tendency to stiffness - structured physiotherapy, if necessary early imaging of the rotator cuff.
• Younger athletes: good healing tendency, but risk if return-to-play is too early - test-based release protocol.
• Anticoagulants/anticoagulation: higher risk of hematoma – close monitoring.
• Hypermobility/multidirectional instability: targeted stabilization program, rarely surgical stabilization.

Your treatment in Hamburg – transparent and conservative first

After emergency care, we accompany you in our orthopedic practice in Hamburg, Dorotheenstraße 48, 22301 Hamburg, through diagnostics, therapy planning and rehabilitation. We work conservatively and only plan surgical measures if there is a clear indication. This includes careful clinical follow-up, targeted imaging and an individual exercise and stress concept.

• Structured aftercare including neurovascular control after reduction.
• Coordinated physiotherapy with comprehensible goals per treatment phase.
• Close exchange with specialized partners (radiology, vascular surgery/neurosurgery) if necessary.
• Joint decision-making without promises of cure – safety and function are the priority.