Li Jie,Long Jiangtao,Wang Qianqian,et al.Effect of different femoral neck anteversion angles on femoral biomechanics in children with developmental dislocation of the hip[J].Journal of Clinical Pediatric Surgery,,22():757-761.[doi:10.3760/cma.j.cn101785-202205019-011]
Effect of different femoral neck anteversion angles on femoral biomechanics in children with developmental dislocation of the hip
- Keywords:
- Developmental Dysplasia of the Hip; Hip Dislocation; Congenital; Femur Neck; Bone Anteversion; Lower Extremity; Biomechanical Phenomena; Child
- Abstract:
- Objective To apply computer simulation technology to simulate the stress distribution of femur in children with developmental dislocation of the hip (DDH) with different angles of femoral neck anteversion to find the significance of femoral neck anteversion correction in DDH children and guide the formulation of surgical plan.Methods A 6-year-old girl of right developmental hip dislocation was retrospectively analyzed in June 2021.The femoral scan data of left hip joint at normal side were extracted.A three-dimensional femoral model was reconstructed by 3D-CT scan.The mechanical simulation models of femoral neck anteversion at 35°, 25° and 15° were designed respectively.The finite element software was utilized for simulation calculation to observe the biomechanical distribution of femur at different neck anteversion angles.Results At a femoral neck anteversion angle of 35°, 25° and 15°, maximal stress of femoral model was 21.18 MPa, 17.36 MPa and 9.847 MPa respectively.At a femoral neck anteversion angle of 35°, stress of femoral shaft was concentrated.At a femoral neck anteversion angle of 25°, stress of distal femoral epiphysis declined by 25%.At a femoral neck anteversion angle of 15°, femoral stress was concentrated in femoral head and neck to upper femoral shaft.At a femoral neck anteversion angle of 35°, a displacement >1 mm interval was from femoral head to middle of femoral shaft; at a femoral neck anteversion angle of 25°, the range of displacement >1 mm was from femoral head to middle/upper end of femoral shaft; at a femoral neck anteversion angle of 15°, the range of displacement >1 mm was from femoral head to femoral neck.At a femoral neck anteversion angle of 35°, 25° and 15°, the maximal displacement of distal femoral epiphysis was 0.0041, 0.0018 and 0.0012 mm respectively.Conclusion Femoral neck anteversion has an important impact on femoral mechanics in children with developmental hip dislocation.With the angles of femoral neck anteversion, stress distribution of femur changes.With a rising femoral neck angle, stress of femoral shaft gradually increases and stress concentration occurs at femoral shaft position.The greater anteversion angle of femoral neck, the greater shielding effect of stress transfer in femoral shaft area and the greater deformation of distal femoral epiphysis in cross section.With a femoral neck anteversion angle of 15°, femoral stress distribution is satisfactory.
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Memo
收稿日期:2022-05-06。
基金项目:山西省卫生健康委科研基金(2021131);山西省教育厅科研基金(2022L198)
通讯作者:席红卫,Email:xihongwei148@sina.com