[A case of compression of the posterior tibial nerve by a synovial cyst with impact on the superior tibiofibular joint].

The authors report a case of compression of the posterior tibial nerve by a cyst originating from the superior tibio-fibular joint. The clinical signs were dysesthesia of the sole of the foot and paresis of the toe flexors. The diagnosis was obtained by electromyographic studies. The patient recovered completely after surgical excision of the cyst, which had developed beneath the tendinous arch of origin of the soleus muscle.