Anatomy
Thumb side, further row of carpal bones, between scaphoid and 1st metacarpal, has deep palmar groove for flexor carpi radialis. Attachments; origin opponens pollicis, and abductor, flexor pollicis brevis, transverse carpal ligament. The saddle-shaped surface articulating with 1st meta-carpal allows large range of thumb movement including opposition.
Clinical
Often removed in treatment of basal thumb arthritis (or carpometacarpal or CMC arthritis – commoner in women).
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