<unk>  is a medical condition resulting in the inability to flex a finger adjacent to a finger with a previously injured flexor digitorum profundus (FDP) tendon. The pathophysiology is that the shortest of the FDP tendons to the long, ring, and small fingers determines their maximum excursion due to their common muscle belly.
Quadrigia
Pleurothotonus
Paramyotonia congenita
Myotonia congenita
Lonomia
Periodic paralysis
Bobble-head doll syndrome
Onychotillomania