1. What is the cause of carpal bones rotating in a zig-zig fashion?
2. What is the piano key sign?
3. What is resorptive arthropathy?
Answers:
1. Caused by ligament laxity: proximal row rotates volarly, distal row rotates dorsally.
2. Proliferating synovium leads to rupture or destruction of ulnar collateral ligament, so there is floating of the ulnar head.
3. Digits are shortened and phalanges appear retracted with skin folds, resulting in telescoping appearance of digits.
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