Compare the joint structure of the metacarpophalangeal (MCP) joints with that of the interphalangeal (IP) joints of the fingers. Identify both similarities and differences
What will be an ideal response?
ANS:
The MCP joints are condyloid while the IP joints are hinge. The MCP joints have more articular surface posteriorly, allowing some hyperextension, while the IP joints generally stop at neutral. Both MCP and IP joints have volar plates with identical structure. The heads of the metacarpals are tied together or joined by the transverse metacarpal ligament, whereas the heads of the phalanges are not connected. Both MCP and IP joints have large capsules and collateral ligaments, but the collaterals of the IPs are tight in both flexion and extension, while the collaterals of the MCPs are tight only in flexion.
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