| Eric A. Brandser, M.D.
Peer Review Status: Internally Peer Reviewed
If one metacarpal phalangeal joint (MCP)
is involved with rheumatoid arthritis, then typically all
of the joints are involved. In this image we see that every
MCP joint is affected. The DIP (distal interphalangeal) joints
are relatively spared. This patient has also developed ligamentous
abnormalities due to RA. A radial deviation of the carpus
and ulnar deviation of the digits give the hands a characteristic
zig-zag pattern.
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