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Six fresh-frozen adult cadaveric specimens were mounted in an Instron materials testing machine with use of a cemented intramedullary rod. Angular relationships between the first metatarsal and the talus were recorded with a sonic digitizer. A flatfoot deformity was created by dividing the talonavicular joint capsule (superiorly, medially, and inferiorly), the spring ligament, the anteromedial aspect of the subtalar joint capsule, and the plantar fascia. Angular displacement in the sagittal and transverse planes was recorded at no load and at 100, 350, and 700-newton plantar loads. Each specimen was subjected to four different reconstructions with tenodesis, and the angular relationship between the first metatarsal and the talus was measured at the four levels of load. A reconstruction with use of the peroneus longus tendon was performed by preserving its insertion into the first metatarsal, rerouting the tendon and passing it from medial to lateral through a calcaneal bone tunnel, and anchoring it to the lateral aspect of the calcaneus. A reconstruction with the tibialis anterior tendon was performed by passing the medial third of the tendon from dorsal to plantar through the navicular and from medial to lateral through the calcaneal bone tunnel and securing it to the lateral aspect of the calcaneus. The reconstruction with the tibialis anterior tendon was repeated with the tendon graft routed along the medial aspect of the navicular, directly through the calcaneal bone tunnel. The fourth reconstruction was done with use of an Achilles tendon allograft. For this procedure, a bone plug was secured, with an interference screw, in the medial aspect of the calcaneal bone tunnel, and the graft was passed from plantar to dorsal through the navicular and sewn to itself.The reconstruction with the peroneus longus tendon provided significantly greater correction of the deformity in both the transverse and the sagittal plane at all levels of load (p < 0.05), except the 700-newton load in the transverse plane. All reconstructions corrected, at least partially, the deformity at both no load and the 100-newton load.The methods that are used for reconstruction of a ruptured tibialis posterior tendon do not correct the acquired flatfoot deformity of this condition. A supple deformity without osseous deformity should be amenable to soft-tissue reconstruction. Of the four methods that we evaluated for reconstruction of a flatfoot deformity, the one involving use of the peroneus longus provided the best correction in both the transverse and the sagittal plane. We believe that it has the greatest potential for success in a clinical situation.