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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
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:
assistant
The correct answer is  Ans. A. The fact that ulnar half of FDP is paralyzed and hence there is no flexion at the IP joints.Claw hand basically is because of paralysis of the lumbricals whose action is flexion at the MCP joint and extension at the IP joints. A claw hand is extended at the MCP and flexed at the IP because of unopposed action of the long flexors, since in the High ulnar lesion the long flexor is paralyses, there is less clawing.