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October 1, 1959Journal of Bone and Joint Surgery

Downward dislocation is prevented by a locking mechanism dependent on the slope of the glenoid fossa, tightening of the superior part of the capsule, and activity of the supraspinatus muscle, rather than vertically running muscles.

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Population

22 healthy men and anatomical dissections

Design

Other

Authors

JBJohn V. BasmajianFBF. J. Bazant

Discussion

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Overview

Supports glenoid and supraspinatus roles in inferior shoulder stability; leaves open clinical translation to dislocation prevention.

Structured PICO

P
Population
22 healthy men and anatomical dissections
I
Intervention
Electromyographic study of various muscles in the region of the shoulder joint combined with a study of dissections
O
Outcome
Factors preventing downward dislocation of the adducted shoulder joint

Downward dislocation of the shoulder is prevented by a specific locking mechanism involving the glenoid fossa slope, capsular tightening, and supraspinatus activity, rather than vertical muscles.

Cite This Study

Basmajian et al. (1959) studied this question.

synapsesocial.com/papers/6a818101d7cc36764366397ehttps://doi.org/10.2106/00004623-195941070-00002
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