Progression of equinus deformity in Duchenne muscular dystrophy.

This study investigated the influence of orthoses, regular passive stretching, and surgery on progression of equinus deformity in Duchenne muscular dystrophy. The extent of passive dorsiflexion on the right foot of ambulant and wheelchair-ambulatory patients was measured monthly with an electronic ankle goniometer calibrated to an accuracy of 1 degree. The mean rate of equinus progression was 0.4 degree per month during the 12-month study. Progression was less in those boys who had prior surgery and were older. Progression was slowest during the first five months of the study (when night splints were used more frequently) and greatest during a long vacation when regular passive stretching by physiotherapists and supervision of splinting were unavailable. These results, although based on a limited patient sample size, indicate that gains from use of orthoses and passive stretching can be lost in the absence of professional supervision.