DOI: https://doi.org/10.22141/1608-1706.3.19.2018.136405

Walking simulation with reduced hip abductor moment arm

S.S. Strafun, О.V. Fischenko, О.D. Karpinska

Abstract


Background. One of the features of hip arthroplasty is the non­compliance with the hip abductor moment arm of the prosthetic joint as compared to the contralateral one. The difference in the length of the hip abductor moment arm of prosthetic and non­prosthetic joints can reach 40 mm. The features of the walking biomechanics in these patients have not been studied enough. The purpose was to assess the effect of reducing the hip abductor moment arm on the parameters of gait after arthroplasty using mathematical model. Materials and methods. The simu­lation was carried out using the OpenSim software. The 3D computer model gait2392_simbody.osim with 23 degrees of freedom in the human musculoskeletal system served as a basic model. The non­scaled version of the model is a subject with 1.8 m of height and 75.16 kg of weight. To create a model for the analysis of patients’ walking after hip replacement, we performed a modification of the basic model, namely, a change in the shape of the femur, where the normal head was replaced by an endoprosthesis with specified parameters. The change in the hip abductor moment arm was regulated by shortening the neck of the endoprosthesis. Results. The function of the prosthetic limb muscles was analyzed with two options for reducing the hip abductor moment arm and in normal length. The shortening of the hip abductor moment arm was 10 and 20 mm. The possibilities of individual muscles to develop necessary efforts to ensure a normal gait in conditions of a reduced length of the hip abductor moment arm are determined. Conclusions. The performed walking modeling with an asymmetric shortening of the hip abductor moment arm showed that even a slight (up to 10 mm) decrease leads to a loss of the muscle ability to develop the necessary force for making certain movements. The phases of one­leg standing and rolling the feet from heel to toes are most sensitive to walking. The most sensitive are the long muscles responsible for lifting the leg and a group of muscles that provide balance in one­leg­standing.


Keywords


hip joint; arthroplasty; hip abductors

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