[Anterior tarsectomy for cavus foot. Retrospective study of 52 cases].

The authors reviewed 34 patients treated by tarsectomy for idiopathic pes cavus deformity between 1977 and 1996. Fifty two feet were treated surgically. All patients had undergone previous conservative treatment. The average age was 40 years. Podoscopic examination revealed 24 cavus feet stage 2, 28 cavus feet stage 3, adduction of the forefoot in 15 cases and an equinus deformity in 8 cases. On radiographic examination, Djian-Annonier's angle was 108 degrees on average. All patients were evaluated with a minimum ot two years follow-up, according to the evaluation system of the Massachusetts General Hospital. With an average follow-up of six years and six months, overall results were; 65.5% very good and good, 21% fair, 13.5% poor. The morphological correction was poor in 9 cases. Djian-Annonier's angle was 125 degrees on average. A number of cavus feet do not justify surgical treatment, because they are well tolerated, sometimes with orthopedic orthoses. Tarsectomy must be avoided in neurological conditions. We do not advise release of soft tissue or Dwyer's calcaneal osteotomy. In our opinion, the choice indication for anterior tarsectomy is the nonrigid cavus foot. It must be combined with lengthening of the Achilles tendon when a deficit of dorsiflexion of the foot persists following tarsectomy. According to their importance, associated deformations will be treated in the same operative session or not.