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Categories: Abstracts, 2025-Jan, Poster

Comparative Biomechanical Study of Different Screw Fixation Methods For Minimally Invasive Hallux Valgus Surgery: A Finite Element Analysis

T Lewis, A Newton, H Mansur, G Ferreira, M Filho, L Battaglion, R Zambeli, R Ray, G Nunes

¹King’s Foot and Ankle Unit, King’s College Hospital NHS Foundation Trust, London
²Department of Orthopedic Surgery,Hospital Santa Helena, Brasília, DF, Brazil
³Foot and Ankle Surgery Group, Orthopaedics and Traumatology Unit, Prevent Senior, Sao Paulo, Brazil
⁴Head of Foot and Ankle Surgery Group, Orthopaedics and Traumatology Unit, Prevent Senior, Sao Paulo, Brazil
⁵Sao Paulo University, USP, Ribeirao Preto,SP, Brazil
⁶Faculty of Medical Sciences, Belo Horizonte, Minas Gerais, Brazil
⁷COTE Brasilia Clinic, Foot and Ankle Unit, Brasilia, DF, Brazil

Background: There are different screw configurations utilised for minimally invasive hallux valgus (HV) deformity despite limited biomechanical data assessing the stability and strength of each construct. We aimed to compare the strength of various screw configurations for minimally invasive HV surgery using finite element analysis (FEA).

Methods: A FEA model was developed from a CT of a female with moderate HV deformity. Five screw configurations utilizing one or two bicortical or intramedullary screws were tested. Stress analysis considered osteotomy displacement, maximum and minimum principal stresses, and von Mises stress for both implants and bone for each screw configuration.

Results: Fixation with two screws (one bicortical and one intramedullary) demonstrated the lowest values for osteotomy displacement, minimum and maximum total stress, and equivalent von Mises stress on the bone and screws in both loading conditions.

Conclusion: The optimal configuration when performing minimally invasive surgery for moderate HV is one bicorticaland one intramedullary screw.

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Tags: MIS Hallux Valgus Basic Science

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P14-Ayla-Newton(.pdf, 900.03 KB) - 22 download(s)

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