0005880 Metacarpophalangeal synostosis	0006152 Proximal symphalangism of hands	0009635 Synostosis of thumb phalanx	0009703 Synostosis involving the 1st metacarpal
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0009640 Synostosis of the proximal phalanx of the thumb with the 1st metatcarpal

synonym

Fusion of the innermost bone of the thumb with the 1st long bone of hand