TREATMENT OF VOLAR INSTABILITY OF THE METACARPOPHALANGEAL JOINT OF THE THUMB BY VOLAR CAPSULODESIS

The metacarpophalangeal joint bears most of the stresses to which the thumb ray is subjected. Instability of this joint results in considera ble functional impairment of the hand. Volar instability may be second ary to trauma, rheumatoid arthritis, or adduction spasms in cerebral p alsy. The resulting hyperextension causes pain and weakness of pinch ( Fig 1). Various techniques have been described to correct this deformi ty. We prefer a volar capsulodesis as first described by Filler (1976) , in which the whole volar plate is reinserted. Detailed knowledge of the complicated volar anatomy is essential. We have treated eight pati ents (two bilaterally) with this technique, all with satisfactory resu lts.