Finite element analysis on femur subjected to knee joint forces during incline-decline walking

doi:10.19101/ijatee.2021.875494

Cited by 1 publication

(1 citation statement)

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“…Typically, articulating surfaces of the femoral condyles were fully constrained in all translational and rotational DoF, a simplistic representation of the knee joint that is better represented as a moving hinge-type joint with both rotational and sliding motion 44 . Several studies also constrained either femur diaphysis or head 45 – 47 in all DoF. Again, these constraints do not mimic the physiological mechanics of the human femur as the effects of distally attached muscles, as well as tibiofemoral and patellofemoral contact are minimised, while constraints also do not respect the dynamics of the NMSK system used to calculate joint and muscle forces.…”

Section: Methodsmentioning

confidence: 99%

Effect of different constraining boundary conditions on simulated femoral stresses and strains during gait

Bavil,

Eghan-Acquah,

Diamond

et al. 2024

Sci Rep

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Finite element analysis (FEA) is commonly used in orthopaedic research to estimate localised tissue stresses and strains. A variety of boundary conditions have been proposed for isolated femur analysis, but it remains unclear how these assumed constraints influence FEA predictions of bone biomechanics. This study compared the femoral head deflection (FHD), stresses, and strains elicited under four commonly used boundary conditions (fixed knee, mid-shaft constraint, springs, and isostatic methods) and benchmarked these mechanics against the gold standard inertia relief method for normal and pathological femurs (extreme anteversion and retroversion, coxa vara, and coxa valga). Simulations were performed for the stance phase of walking with the applied femoral loading determined from patient-specific neuromusculoskeletal models. Due to unrealistic biomechanics observed for the commonly used boundary conditions, we propose a novel biomechanical constraint method to generate physiological femur biomechanics. The biomechanical method yielded FHD (< 1 mm), strains (approaching 1000 µε), and stresses (< 60 MPa), which were consistent with physiological observations and similar to predictions from the inertia relief method (average coefficient of determination = 0.97, average normalized root mean square error = 0.17). Our results highlight the superior performance of the biomechanical method compared to current methods of constraint for both healthy and pathological femurs.

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Section: Methodsmentioning

confidence: 99%