What metacarpophalangeal (MCP) joint position is most prone to injury and why?
What will be an ideal response?
ANS:
MCP extension is more vulnerable than flexion, because flexion is the close-packed position for the MCP joint. When the joint is close-packed, all the ligaments and capsule are maximally taut, drawing the joint surfaces together and increasing stability. In extension, that capsule is loose-packed and more vulnerable to shear and torsional forces across the joint surfaces.
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