Quiz-280-Section One

What is the primary reason the glenohumeral joint relies heavily on soft tissue constraints rather than bony congruency for stability?

Glenohumeral Joint Architecture and Stability

The humeral head has a radius of curvature three times smaller than the glenoid fossa

The glenoid fossa covers only 25–30% of the humeral head surface at any given position.

The fibrocartilaginous labrum is poorly vascularised in the anterior-inferior quadrant.

The rotator cuff muscles act as static restraints that do not respond to velocity.

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A 24-year-old patient sustains a traumatic anterior glenohumeral dislocation during a contact sport. Which pathological finding is considered the most consistent structural lesion associated with first-time anterior dislocations in patients under 40 years of age?

Pathoanatomy of Anterior Dislocation (The "Unhappy Triad")

An engaging Hill-Sachs defect occupying more than 25% of the articular surface.

Avulsion of the posterior-inferior labrum known as a reverse Bankart lesion.

Fracture of the greater tuberosity occurring in isolation without labral involvement.

Detachment of the anterior-inferior labrum from the glenoid rim, known as a Bankart lesion.

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The paramedic is assessing a patient following a first-time anterior shoulder dislocation. According to epidemiological data, which factor is the single most powerful independent predictor of future recurrence?

Recurrence Risk Stratification

The degree of glenoid bone loss exceeding 20%.

Participation in overhead or collision sports.

The patient's age at the time of the initial injury.

The presence of a large Hill-Sachs defect.

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A 62-year-old patient presents with an anterior shoulder dislocation following a low-energy fall. Unlike younger patients, what associated injury pattern should the paramedic suspect as highly probable in this demographic?

Age-Related Injury Patterns (Geriatric Considerations)

Isolated Bankart lesion requiring urgent orthopaedic stabilization.

Full-thickness rotator cuff tear or greater tuberosity fracture.

Axillary nerve neuropraxia with complete sensory loss in the regimental badge area.

Subclavian arterial disruption leading to immediate pulselessness.

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A patient post-seizure presents with guarded shoulders. Which clinical finding is most specific for a posterior glenohumeral dislocation and warrants suspicion despite a potentially normal AP radiograph?

Diagnosis of Posterior Dislocation

The arm is held in slight abduction and external rotation.

The anterior shoulder contour appears squared-off with prominent acromion.

Active and passive external rotation is blocked while internal rotation is preserved.

Significant ecchymosis tracking down the medial arm is visible immediately.

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During the pre-hospital assessment of a patient with a deformed shoulder, which finding mandates deferring closed reduction and prioritising immobilisation in the position of comfort for transport?

Contraindications to Field Reduction

Presence of a diminished radial pulse that equalises after traction is applied.

Palpable skin tenting over a bony fragment.

Complete absence of sensation in the lateral deltoid region.

History of a seizure episode followed by bilateral shoulder pain.

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