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Your Patient Has an "Extensor Lag" of the MCP Joints

Question 18

Multiple Choice

Your patient has an "extensor lag" of the MCP joints.What does this suggest?


A) It is possible to extend the MCP joint passively through the full range of extension,but full active MCP extension is not possible,owing to weakness of the extensor digitorum.
B) Posterior (dorsal) sliding of the proximal phalanx on the head of the metacarpal is restricted.
C) Full passive MCP extension is not possible.
D) It is possible to extend the MCP joint passively through the full range of extension,but full active MCP extension is not possible,owing to weakness of the lumbricales.

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