The Journal of Bone and Joint Surgery, Vol 75, Issue 10 1451-1456, Copyright © 1993 by Journal of Bone and Joint Surgery, Inc
Functional analysis of patients who have had a modified Van Nes rotationplasty
JR Steenhoff, HA Daanen and AH Taminiau
Orthopaedic Department, University Hospital Leiden, The Netherlands.
Electromyographic analysis of gait in eight patients who had had a modified
Van Nes rotationplasty was performed to compare the activity of the flexors
and extensors of the ankle on the side of the operation with that of the
flexors and extensors of the knee on the normal, contralateral side. The
resemblance in the activity of the extensors was more pronounced than that
of the flexors. In three patients, the angle of flexion of the knee
throughout the gait cycle was the same on the side of the rotationplasty as
on the normal side. There was more symmetry in the swing phase than has
been reported for patients who have had an above-the-knee amputation. The
strength of the dorsiflexors of the ankle on the side of the rotationplasty
was 68 percent and that of the flexors was 71 per cent when compared with
that of the muscles of the normal ankle.