Prediction and Effectiveness Verification of Chevron Osteotomy Surgical Plan Using Finite Element Method

A foot finite element model was established based on the CT imaging data of the right foot of a patient with moderate hallux valgus. The validity of the model was verified by plantar pressure test and scaphoid subsidence test. Six Chevron osteotomy schemes were simulated in the software Solidworks to predict the therapeutic effects of different schemes on hallux valgus. Through the comparison between the simulation and experimental data, it is found that the plantar pressure is consistent with the scaphoid subsidence index, which proves that the model is effective, in which the plantar pressure distribution simulated by finite element method is the same as the actual measured plantar pressure distribution, and the maximum stress difference is 7.7%. The simulated height of scaphoid sinking height is 7.94 mm, and the experimental result is 7.65 mm. The peak stress of the first metatarsophalangeal joint decreased when the first metatarsophalangeal joint moved laterally, and the stress of the osteotomy joint at the distal 4mm was 0.48 Mpa and 0.61 MPA respectively. Osteotomy at distal 1/5 and 2/5 sites will result in increased displacement of the first metatarsal bone.