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  • Title: Functional Outcomes Following Anterior Transfer of the Tibialis Posterior Tendon for Foot Drop Secondary to Peroneal Nerve Palsy.
    Author: Cho BK, Park KJ, Choi SM, Im SH, SooHoo NF.
    Journal: Foot Ankle Int; 2017 Jun; 38(6):627-633. PubMed ID: 28552040.
    Abstract:
    BACKGROUND: This retrospective comparative study reports the practical function in daily and sports activities after tibialis posterior tendon transfer for foot drop secondary to peroneal nerve palsy. METHODS: Seventeen patients were followed for a minimum of 3 years after tibialis posterior tendon transfer for foot drop secondary to peroneal nerve palsy. Matched controls were used to evaluate the level of functional restoration. Functional evaluations included American Orthopaedic Foot & Ankle Society (AOFAS) scores, Foot and Ankle Outcome Score (FAOS), Foot and Ankle Ability Measure (FAAM) scores, and isokinetic muscle strength test. Radiographic evaluation for the changes of postoperative foot alignment included Meary angle, calcaneal pitch angle, hindfoot alignment angle, and navicular height. RESULTS: Mean AOFAS, FAOS, and FAAM scores significantly improved from 65.1 to 86.2, 55.6 to 87.8, and 45.7 to 84.4 points at final follow-up, respectively. However, all functional evaluation scores were significantly lower as compared to the control group ( P < .001). Mean peak torque (60 degrees/sec) of ankle dorsiflexors, plantarflexors, invertors, and evertors at final follow-up were 7.1 (deficit ratio of 65.4%), 39.2, 9.8, and 7.3 Nm, respectively. These muscle strengths were significantly lower compared to the control group ( P < .001). No significant differences in radiographic measurements were found, and no patients presented with a postoperative flat foot deformity. One patient (5.9%) needed an ankle-foot orthosis for occupational activity. CONCLUSIONS: Anterior transfer of the tibialis posterior tendon appears to be an effective surgical option for paralytic foot drop secondary to peroneal nerve palsy. Although restoration of dorsiflexion strength postoperatively was about 33% of the normal ankle, function in daily activities and gait ability were satisfactorily improved. In addition, tibialis posterior tendon transfer demonstrated no definitive radiographic or clinical progression to postoperative flat foot deformity at intermediate-term follow-up. LEVEL OF EVIDENCE: Level IV, retrospective case series.
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