The Treatment of Spastic Planovalgus Foot Deformity in the Neurologically Impaired Adult

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Abstract
The surgical correction of 14 feet with spastic planovalgus in the neurologically impaired adult is reviewed. Evaluation of the patterns of lower extremity muscle activity preoperatively by dynamic EMG showed overactivity of the peroneus longus. A new gait pattern which has not been previously reported was observed. This “combination foot” deformity, noted in six patients, consists of equinovarus in swing, and planovalgus in stance during the gait cycle. The remaining eight patients exhibited planovalgus in swing and stance. Transfer of the peroneus longus tendon to either the cuboid or navicular was performed in seven (50%) patients. Release of the peroneus longus was performed in four (29%) patients. Two patients had Z-lengthening of the peroneus longus, and tenodesis of the peroneus longus to posterior tibialis was performed in one patient. The mean postoperative follow-up time was 34.6 months. All feet were plantigrade. Ten (71%) feet were balanced. Four (29%) feet were improved. There were no failures or complications. Thirteen patients were able to ambulate independently after surgery and one patient continued to require only stand-by-assistance secondary to balance problems. No patient decreased in ambulation level. Seven (64%) of the 11 patients who required bracing, preoperatively became brace free. Peroneus longus was found to be the major deforming force in spastic planovalgus. Release, transfer, or tenodesis of the peroneus longus is effective in correcting planovalgus.

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