環指中手指節（MP）関節掌側脱臼の1例

Volar Dislocation of the Metacarpophalangeal Joint of the Ring Finger. Case Report

　環指中手指節（MP）関節掌側脱臼の1例を経験した．症例は60歳の女性である．歩行中に転倒受傷した．近医での徒手整復後5週で再脱臼し，当科を紹介されて受診した．6週で手術を施行した．関節内の瘢痕切除と伸筋腱固定を行い，術後3週で関節可動域訓練を開始した．術後4カ月の最終診察時の自動関節可動域は伸展－10°，屈曲65°であったが，単純X線像では関節症性変化と亜脱臼傾向を認めた．

　We report a case of traumatic volar dislocation of the metacarpophalangeal (MP) joint of the ring finger in a 60-year-old woman. The patient injured her right ring finger when she struck her outstretched hand in a fall. Closed reduction of the volar dislocation was performed immediately, but radiograph 5 weeks after the injury revealed recurrence of the dislocation. Closed reduction was attemted but failed, and open reduction was performed. Scar tissue in the joint was removed, and the volar dislocation was reduced. Extensor tenodesis was performed, and a Kirschner wire was passed through the MP joint to maintain the reduction. Three weeks postoperatively the Kirschner wire was removed, and excercise was started. At 4 months after surgery, active range of motion was－10 degrees in extension and 65 degrees in flexion. Radiographs showed osteoarthritic change and subluxation of the joint.