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Review Question - QID 6644

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QID 6644 (Type "6644" in App Search)
An extended head hemiarthroplasty (rotator cuff tear arthropathy head) has what theoretic advantage when compared to a standard hemiarthroplasty?

Improved superior stability

16%

160/1004

Fixed fulcrum kinematics

5%

50/1004

Creates a metal-to-bone articulation with the acromion

27%

269/1004

Increased deltoid moment arm

41%

412/1004

Increased glenohumeral offset

10%

105/1004

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The theoretic advantage of a metal-to-bone articulation with the acromion is that there is a greater arc in which a smooth metal surface contacts the glenoid and acromion. This may improve pain and function, but no studies have evaluated this to date. One study showed results comparable to that of a standard hemiarthroplasty. There are no other biomechanic advantages.

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