Abstract

Mohamed Badr Errachid*, Ismail Kebbaj, Moncef Boufettal, Reda Lah Bassir, Kharmaz, M. O. Lamrani and M. S. Berrada

ABSTRACT

Dorsal dislocations of the metacarpophalangeal joint of the thumb are less common than the index finger and much more frequent than palmar dislocations.We present a case report about dorsal dislocation of the metacarpophalangeal thumb joint in a 17-year-old boy with successful closed reduction and satisfactory long-term followup. Reduction maneuvers must be strictly respected to avoid conversion to bloody reduction : a slight metacarpophalangeal extension followed by application of digital pressure on the base of the first phalangeal in the palmar and distal direction associated with possible movement of the thumb in subtle rotations as the reduction progresses to overcome the interposed tissues. These tissues are palmar plate, the flexor pollicis longus of the thumb and sesamoid bones incarceration in articular joint can be induced during false reduction maneuver if proceeded with excessive hyperextension or traction. The search for generalized ligament laxity and damage to the collateral ligaments of the metacarpophalangeal joint should be systematic.