Metacarpophalangeal

[Magaret]

relating to the metacarpals (= the five bones between the fingers and the wrist) and the phalanges (= the small bones of the fingers) :

[Julene]

Designating the joint between a metacarpal bone and a proximal phalanx (finger bone); of or relating to this joint, or (more broadly) to the metacarpal and phalangeal bones.