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2427 Orthopaedics

In high lesions of ulnar nerve like elbow fractures or dislocations the degree of clawing is markedly less than in low ulnar lesions this is called ULNAR PARADOX and is due to:

AThe fact that the ulnar half of the FDP is paralyzed and hence there is no flexion at the IP joints. (Correct Answer)
BThe lumbricalis are spared and hence there is no clawing
CThe Median nerve compensates for the ulnar nerve
DThe interossei increase their tone and extend the IP joint