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Unformatted text preview: contracted the head of the humerus slips out of the glenoid fossa comes to rest beneath the coracoid process most common dislocation o Downward or subglenoid dislocation not common o Posterior dislocation not common The shoulder is usually well protected from these two injuries o by the top portion of the joint capsule o by the upward tilt of the glenoid fossa o by the supra spinatus and posterior deltoid o such dislocations (when they do occur) are due to: a blow to the top of the shoulder when the arm is slightly abducted...
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- Spring '10