Analysis of Influence of Semitendinosus Transposition on Hip Movement Based on Three-dimensional Finite Element
Objective:To analyze the effect of semitendinosus transposition on rotation and extension of hip.Methods:CT and MRI image data of volunteer were collected to construct a three-dimensional finite element model of hip and knee,and the spring model of the muscles related to hip rotation and extension was calculated and established.The relevant muscles were successively loaded to simulate the total stress and total deformation of the femur under the semitendinosus intact,transposition and missing,so as to evaluate the impact on the internal rotation and extension function of the hip.Results:The three-dimensional finite element model of hip and knee,which included bone,ligament and muscle,was successfully constructed by fitting CT and MRI image data,and the parameters of each muscle spring model were calculated.In the finite element model of hip rotation,when the semitendinosus was intact,the overall stress of femur caused by hip rotation muscle group was 0.59057 MPa,the semitendinosus transposition was 0.90023 MPa,and semitendinotomy was 0.48851 MPa.In the case of intact semitendinosus,the total femur deformation caused by hip rotators was 4.1081 mm,the semitendinosus transposition was 3.9998 mm,and semitendinotomy was 3.0244 mm.In the finite element model of hip joint extension,when the semitendinosus was intact,the overall stress of femur caused by hip joint extension muscle group was 2.8383 MPa,the semitendinosus transposition was 2.1019 MPa,and the semitendinotomy was 1.4665 MPa.In the case of intact semitendinosus,the total femur deformation caused by hip extension muscle group was 6.6956 mm,the semitendinosus transposition was 6.314 mm,and the semitendinotomy was 4.6261 mm.Conclusion:Semitendinosus transposition can better maintain the internal rotation and extension function of the hip than semitendinotomy,and semitendinotomy has a significant effect on hip movement,which may bring the associated risk of sports injury.
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