Biomechanical evaluation of a lower-limb implant model under gait and stumbling conditions using finite element analysis.

Abstract

Addressing the needs of patients with lower-limb amputations remains a complex challenge due to the unique biomechanical and personal requirements of each individual. An effective prosthesis must be carefully adapted to ensure optimal comfort, flexibility, and stability. This study presents a finite element analysis aimed at developing an optimal implant model evaluated during lower-limb locomotion, specifically under two scenarios: normal walking and stumbling. The stumbling phase presents increased biomechanical demands, requiring greater balance and structural resilience. The analysis focuses on the influence of varying the liner's Young's modulus on the distribution of equivalent Von Mises stresses in the femur and implant. Additionally, the study investigates contact pressure and longitudinal shear stress distributions on the liner, providing a comprehensive comparison across all cases. The findings contribute valuable insights toward the optimization of prosthetic design for improved comfort and safety in everyday movement.