| Objective We will establish a three-dimensional finite element model of hallux valgus foot and simulate the Scarf osteotomy to carry out the mechanical analysis.To find out the optimal osteotomy scheme.We hope to provide a detailed surgical techniques for young doctors,improving the success rate of the operation.Method One moderate hallux valgus volunteer was selected for 64 row spiral CT plain scan.To establish the finite element model of hallux valgus foot and verify the validity of the model.According to the preoperative radiographs to make foot osteotomy scheme:the osteotomy angle of Z-type diagonal is 60 degrees,to determine treasonably two vertices of Z-type,osteotomy plane of Z-type arm pointing to the fifth metatarsal head;To change the lateral passage in the distance of Scarf osteotomy and simulate the fracture healed completely.The 5 finite element models are generated and the mechanical analysis is carried out.The horns of the HVA and IM1-2 were compared before and after the operation.According to the results of the finite element analysis,the best Scarf osteotomy method of the patient was determined.Results Under the same loading and constraint,the Von Mises stress under the plantar head had a descending trend when the distal bone block moved to the lateral side,and the second and third and fourth metatarsal bone decreased by a relatively high percentage.The comparison of HVA and IM1-2 with the preoperative 4mm was significantly improved.Conclusions The preoperative finite element analysis of the Scarf osteotomy of the hallux valgus showed that the distal osteotomy block of Scarf osteotomy was fixed to the lateral side after 4mm,which reduced the load of five metatarsal bones,especially the two and three metatarsal bone.This reduces the incidence of metastatic pain at the two and three metatarsophalangeal,satisfing the correction of the deformity,and making the distribution of the plantar foot stress more reasonable. |
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