Treatment of Stage II Posterior Tibial Tendon Deficiency With Flexor Digitorum Longus Tendon Transfer and Calcaneal Osteotomy

Abstract

Background: To assess the efficacy of surgical correction of stage II tibial tendon deficiency with medial translational calcaneus osteotomy and flexor digitorum longus tendon transfer to the navicular, the authors retrospectively reviewed results of treatment of stage II posterior tibial tendon deficiency in 129 patients for whom surgery was performed between 1990 and 1997. Methods: The indication for surgery included tendon weakness, flexible deformity, and foot pain refractory to nonsurgical treatment. All patients had a painful flexible flatfoot without fixed forefoot supination deformity (stage II). A medial translational osteotomy of the calcaneus and transfer of the flexor digitorum longus tendon into the navicular were done. The patients were examined, radiographs were obtained, and isokinetic evaluation of both feet was performed at a mean of 5.2 years postoperatively. The American Orthopaedic Foot and Ankle Society (AOFAS) Hindfoot Scale and Short Form Health Surgery (SF-36) were used to evaluate patients postoperatively. Results: The mean AOFAS score at follow-up was 79 points (range, 54-93). There were seven significant complications in six patients. Isokinetic inversion and plantarflexion power and strength were symmetric with the contralateral limb in 95 patients, mildly weak in 18 patients, and moderately weak in eight patients. Subtalar joint motion was normal in 56 (44%), slightly decreased in 66 (51%), and moderately decreased in seven patients (5%). Correction was significant (p <.05) in all four radiographic parameters evaluated. Patients were entirely satisfied (118 patients), partially satisfied (seven patients), or dissatisfied (four patients). Further, 125 (97%) experienced pain relief, 121 (94%) showed improvement of function, 112 (87%) experienced improvement in the arch of the foot, and 108 (84%) were able to wear shoes comfortably without shoe modifications or orthotic arch support. Conclusions: The surgical correction of stage II posterior tibial tendon deficiency with medial translational calcaneus osteotomy and flexor digitorum longus tendon transfer to the navicular yielded excellent results with minimal complications and a high patient satisfaction rate.

Keywords

Osteotomy Posterior Tibial Tendon Tendon Transfer

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