How much is dorsiflexion restored after PTT transfer to treat foot drop?

Updated: Mar 23, 2020
  • Author: James W Pritchett, MD; Chief Editor: Vinod K Panchbhavi, MD, FACS  more...
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Cho et al reported on 17 patients who underwent PTT transfer for foot drop secondary to peroneal nerve palsy (follow-up, ≥3 years). [30] Mean American Orthopaedic Foot & Ankle Society (AOFAS) score, Foot and Ankle Outcome Score (FAOS), and Foot and Ankle Ability Measure (FAAM) improved significantly at final follow-up: from 65.1 to 86.2, from 55.6 to 87.8, and from 45.7 to 84.4, respectively. However, all functional evaluation scores were significantly lower than in the control group. Mean peak torque was 7.1 Nm for ankle dorsiflexors, 39.2 Nm for plantarflexors, 9.8 Nm for invertors, and 7.3 Nm for evertors at final follow-up. These values were significantly lower than corresponding values in the control group.

No significant differences in radiographic measurements were found, and no patients presented with a postoperative flatfoot deformity. [30] One patient (5.9%) needed an AFO for occupational activity. Cho et al concluded that 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, PTT transfer demonstrated no definitive radiographic or clinical progression to postoperative flatfoot deformity at intermediate-term follow-up.

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