Rotational step-cut osteotomy for treatment of metacarpal and phalangeal malunion.

Metacarpal and phalangeal malunion after fracture or replantation frequently causes rotational deformities with scissoring during digital flexion. Transverse osteotomy at the metacarpal base has been advocated for derotation, but this only partially corrects scissoring resulting from phalangeal malunion. We describe the results of rotational step-cut osteotomies at the site of malunion. There were twenty-three osteotomies in eighteen patients; seven metacarpal and sixteen in the proximal phalanx. The value of the technique is supported by the results; speedy healing of bone, satisfactory alleviation of deformity, and a useful gain in range of motion in many patients.