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Category:   Basic Sciences/BiologicsIntroduction/Purpose:   To investigate the effect of cuboid osteotomy lateral column lengthening (LCL) for the correction of stage? B adult-acquired flatfoot deformity in cadaver.Methods:   Six cadaver specimens were compressively loaded to 350 N. Flatfoot models were established and each was evaluated radiographically and pedobarographically in the following conditions: (1) intact foot, (2) flatfoot, (3) cuboid osteotomy LCL (2, 3, 4, and 5 mm).Results:   Compared with the flatfoot model, the 2-,3-,4-, and 5-mm LCLs showed significant correction of talonavicular coverage on anteroposterior radiographs and talus-first metatarsal angle on both anteroposterior and lateral radiographs. As the graft increased in size incrementally, lateral forefoot pressure increased consistently, and medial pressure decreased significantly except for the 2-mm LCL. Compared with the intact foot, the above angles of the LCLs showed no significant difference except for the 2- mm LCL. In terms of forefoot pressure, medial pressure of the 2-mm LCL and lateral pressure of the 3-, 4- and 5-mm LCLs showed statistical differences, but lateral pressure of the 3-mm LCL was not much more than the intact foot as compared to the 4- and 5-mm LCLs, which was still less than medial pressure.Conclusion:   Cuboid osteotomy LCL procedure avoids damage to subtalar joint and has a good effect on correction of stage? B adult-acquired flatfoot deformity with a 3 mm lengthening in cadavers.

Biomechanical Analysis of Cuboid Osteotomy Lateral Column Lengthening for StageⅡB Adult- acquired Flatfoot Deformity