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Posterior Shoulder Dislocation Wheeless

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Location: http://www.wheelessonline.com/ortho/posterior_shoulder_dislocation

Description: posterior dislocation is rare & should raise possibility of seizure as cause;
- other causes include an electric shock or ECT without muscle relaxants;
- mechanism:
- axial loading of the adducted, internally rotated arm;
- because the internal rotator muscles are approx twice as powerful as the exernal rotator muscles, a sudden contraction (such as from a seizure or shock) will cause the humeral head to dislocate;
- involuntary recurrent posterior subluxation may be associated w/ high forces generated during follow thru phase of various sports activities;
- this develops as humerus is in adduction, flexion, and internal rotation, & maximal contractions of subscapularis and deltoid
Wheeless' Textbook of Orthopaedics

Type: Reference Material
Author/Contact: C.R.Wheeless
Institution: Duke
Primary Subject/Category:

Language: English

Submitted by: admin
Hits: 951
Added: Mon Feb 04 2002
Last Modified: Fri Jul 17 2009