Clubfoot with supernumerary soleus muscle. Report of 2 cases.

In 2 cases of clubfoot with severe and rigid varus deformity, an accessory soleus muscle with attachment on the medial side of the calcaneus was found. After cutting the distal attachment of this muscle, the deformity diminished. The accessory soleus muscle is not interpreted as the primary cause of the clubfoot, but as a highly contributing cause to the rigid varus deformity.