20 Questions
Which joint is the most frequently dislocated major joint?
Glenohumeral joint
What is the usual mechanism for an anterior glenohumeral dislocation?
Fall on the extended arm with the shoulder in extension
Where does the humeral head come to lie in an anterior glenohumeral dislocation?
Medial to the glenoid, just below the coracoid process
What percentage of shoulder dislocations are accounted for by posterior dislocations?
Around 5%
What is a common cause of posterior dislocation?
High-energy trauma
Is glenohumeral dislocation a common injury in children?
No, it is a very unusual injury in children
What is a key clinical feature of posterior dislocation?
Glenohumeral joint fixed in internal rotation
Which type of radiograph is better for diagnosing posterior dislocation?
Axillary or modified oblique views
What are some complications of glenohumeral dislocation?
Axillary nerve injury, brachial plexus palsy, and rotator cuff tears
What is the usual treatment for glenohumeral dislocation?
Closed reduction under sedation
Which method is used for reducing a shoulder dislocation where the elbow is bent to 90 degrees and slowly rotated externally to 75 degrees?
Kocher's method
What is the recommended period of immobilization after closed reduction of a shoulder dislocation in younger patients?
3-4 weeks
What is the main risk in younger patients after closed reduction of a shoulder dislocation?
Recurrent dislocation
What is the most common nerve injury associated with shoulder dislocation?
Axillary nerve
What percentage of patients over the age of 50 with shoulder dislocation have nerve injuries?
30%
What is the recommended imaging modality to diagnose a rotator cuff tear in patients who have not regained active abduction by 4-6 weeks after injury?
Ultrasound or MRI scan
What is the frequency of rotator cuff tears or greater tuberosity fractures in glenohumeral dislocations?
10-30%
When is early mobilization encouraged after closed reduction of a shoulder dislocation?
Patients over the age of 40 years
What is the most common type of fracture associated with posterior dislocations of the shoulder?
Impaction fracture of the humeral head
What is the frequency of recurrent dislocation in patients under the age of 20 with shoulder dislocation?
80%
Test your knowledge on Glenohumeral dislocation, the most frequently dislocated major joint. Learn about the different types of dislocations and their mechanisms.
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