Quiz-280-Section Four

What is the core biomechanical principle that underlies all successful anterior glenohumeral reduction techniques?

Biomechanical Principles of Reduction

Applying sufficient longitudinal force to overcome involuntary rotator cuff spasm.

Neutralising the pain-anxiety-stretch reflex cycle that perpetuates muscle guarding.

Leveraging the humeral head against the coracoid process to force glenoid re-entry.

Achieving full abduction to maximise capsular volume before applying traction.

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How does scapular manipulation achieve reduction of an anterior glenohumeral dislocation fundamentally differently from traction-based techniques?

Scapular Manipulation Mechanics

It applies direct pressure to the humeral head to force it posteriorly into the glenoid.

It rotates the glenoid fossa to align with the displaced humeral head rather than moving the head toward the glenoid.

It uses the long head of the biceps as a fulcrum to lever the humeral head over the glenoid rim.

It progressively stretches the subscapularis through external rotation to permit posterior translation.

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During the external rotation method, what physiological mechanism allows the subscapularis to relax rather than contract when placed on progressive stretch?

External Rotation Method Physiology

The inverse myotatic reflex mediated by Golgi tendon organ activation.

The stretch reflex mediated by muscle spindle discharge.

Active voluntary contraction of the antagonist infraspinatus muscle group.

Compression of the axillary nerve reducing efferent motor signals to the subscapularis.

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An operator accustomed only to anterior reduction techniques attempts a posterior glenohumeral dislocation reduction. Which specific error is most likely to worsen the injury?

Posterior Reduction — Common Errors

Applying external rotation without concurrent lateral humeral head translation.

Applying gentle longitudinal traction in the plane of the scapula.

Using sub-dissociative dose ketamine for analgesia during the procedure.

Applying slow, sustained traction rather than brief high-force pulls.

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After two technically sound, adequately analgesed reduction attempts fail to reduce an anterior glenohumeral dislocation, what is the most appropriate next step?

Failed Reduction Management — The Rule of Two

Attempt a third reduction using a different technique with increased sedation depth.

Apply greater traction force during the next attempt to overcome residual muscle spasm.

Cease further closed reduction attempts, immobilise, and expedite transport for advanced management.

Administer a full dissociative dose of ketamine and repeat the same technique.

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During a reduction attempt, the operator encounters a "rubbery," non-fatiguing resistance that does not change despite adequate analgesia and muscle relaxation. What is the most likely explanation for this finding?

Recognition of Complications

Inadequate pre-procedural analgesia requiring additional opioid dosing.

Soft tissue interposition creating a mechanical block within the joint space.

Normal muscle guarding that will yield with sustained, slow traction.

Incorrect patient positioning that can be corrected by repositioning supine.

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Following successful reduction of a posterior glenohumeral dislocation, in which position should the paramedic immobilize the limb?

Post-Reduction Immobilization — Posterior Dislocation

Adduction and internal rotation using a standard sling and swath.

Slight external rotation using a gunslinger brace or pillow roll.

Full abduction with the arm in a position of overhead elevation.

Neutral rotation with the arm fully extended at the elbow.

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During an anterior shoulder reduction attempt, the operator suddenly feels a loss of resistance accompanied by a new, sharp crepitus and a sudden increase in the patient's pain. The shoulder contour has not normalised. What is the most likely explanation?

Complication Recognition

Successful reduction with expected post-procedural crepitus from capsular stretch.

Iatrogenic fracture of the surgical neck of the humerus.

Spontaneous resolution of muscle guarding allowing the humeral head to translate freely.

Displacement of a previously unrecognised bony Bankart fragment.

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A 19-year-old contact sport athlete has just undergone successful reduction of a first-time anterior shoulder dislocation. Which discharge action is most critical to address this patient's recurrence risk profile?

Post-Reduction Discharge and Recurrence Counselling

Prescribing a prolonged course of opioid analgesia to ensure comfort during the immobilisation period.

Referring to orthopaedic surgery within 2 weeks due to high recurrence risk in this demographic.

Recommending immediate return to sport once the sling is removed at 6 weeks.

Reassuring the patient that recurrence is unlikely given the successful first-time reduction.

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