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Preoperative and postoperative dynamic gait electromyography (EMG) weas performed on 15 patients 8 to 13 year of age with Duchenne's muscular dystrophy who underwent Achilles tendon lengthening and posterior tibial tendon transfer anteriorly through the interosseous ligament for correction of equinus and equinovarus foot deformities. The muscles tested preoperatively (anterior tibial, soleus, gastrocnemius, posterior tibial, peroneal longus, and peroneal brevis) showed phase changes. It is believed that patients with weakened leg muscles fire multiple muscle groups out of phase in an attempt to overcome the action of the stronger muscles, thus stabilizing the limb for ambulation. Postoperative EMGs, performed with the patients walking in long leg braces after the deformity had been corrected, showed little activity in the muscles tested. As the patients became dependent on the brace, the need for the muscles to be active out of phase was eliminated. The transferred posterior tibial muscle appeared to be active both clinically and electromyographically.

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