1. A joint of a finger; any of the joints connecting the metacarpal bones to the proximal phalanges of the fingers
   "Cracking your metacarpophalangeal joints is a common habit for some people";
   - knuckle, knuckle joint

Derived forms: metacarpophalangeal joints

Type of: articulatio synovialis, diarthrosis, synovial joint

Part of: finger

Encyclopedia: Metacarpophalangeal joint