[Traumatic pseudo-boutonniere of the metacarpophalangeal joint of the little finger. Case report and review of the literature].

Dislocation of the extensor tendon over the metacarpophalangeal joint is common among patients with rheumatoid arthritis. Patients without arthritis are exceptionally involved. The authors describe a new case of traumatic boutonniere-like of the metacarpophalangeal joint of the little finger. This lesion is a rarely, only eleven cases are described in literature. Patients are usually young adults and dislocation is related to a direct axial trauma on their fifth metacarpophalangeal joint. Diagnosis is clinical and relies on an incomplete active extension of the metacarpophalangeal joint, secondary to the dislocation of the extensor apparatus. Diagnosis is often delayed the lesion remaining unnoticed with the occurrence of others hand lesions. Proper treatment is surgery, based on suturing side to side both extensor digiti minimi and common extensor tendon over the fifth metacarpophalangeal joint. Results are excellent, with a complete range of motion and the absence of recurrence.