The superficialis minus deformity and its operative treatment.

On removal of the superficial finger flexor the normal sequence of flexion is greatly disturbed if the proximal interphalangeal joint is hypermobile, and a zig-zag deformity results. The pathomechanics of this problem as described by Landsmeer (1958) is reviewed. A modification of Littler's lateral band re-routing operation for correction of the intrinsic plus finger deformity has been developed to correct the superficialis minus deformity. This procedure has been successful in correcting the proximal interphalangeal joint hyperextension in five cases and in preventing its development in three others. Terminal interphalangeal joint flexion deformity has not been eliminated.