Zhongguo gu shang = China journal of orthopaedics and traumatology · 2026
[Coupled finite element analysis of the hip joint and spine in normal individuals and patients with developmental dysplasia of the hip].
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Gao Yongchang, Qiao Guanzhang, Ma Zhangwen, Ma Zihan, Cui Qingfeng, Chen Shibin, Li Hui
Аннотация
OBJECTIVE: To compare the stress distribution,displacement,and sagittal plane parameters of the spine-hip joint complex during daily activities between a normal individual and a patient with developmental dysplasia of the hip (DDH).
METHODS: Based on CT images from a 24-year-old male DDH patient(height:175 cm,weight:65 kg) and a healthy male volunteer,computer aided design(CAD) models of their hip joints and spines were reconstructed using a general orthopaedic method. Coupled finite element models of the spine-hip joint were established. These models were used to predict the stress,displacement in the spine and hip joints,and the postural changes of the pelvis relative to the lumbar spine during static postures(standing and sitting) and dynamic motions (walking and sit-to-stand/stand-to-sit movements).
RESULTS: The predicted ranges of motion for the normal model during spinal flexion-extension,lateral bending,and rotation were within the ranges reported in previous studies,except for a smaller lateral bending angle at L2-L3(5.5° vs. a reported minimum of 7.5°),indirectly validating the finite element model. The predicted maximum stress(1.6 MPa) on the lumbar intervertebral discs occurred at the L5-S disc,while the minimum stress (0.93 MPa) was at the L1-L2 disc,with stress increasing gradually from superior to inferior levels. During static standing and sitting,the DDH patient's spine showed significant stress concentration with higher maximum stress compared to the normal individual. During the gait cycle,the maximum spinal stress in the DDH patient (approximately 279.68 MPa) was significantly higher than that in the normal individual (255.57 MPa),but bilateral pelvic displacement was lower. During sit-to-stand/stand-to-sit motions,the hip joint stress and displacement in the DDH patient showed a trend similar to that during walking compared to the normal individual. Both motion analyses indicated that the spine-hip joint mobility in the DDH patient was lower than normal,suggesting degenerative changes in micromechanical performance.
CONCLUSION: This study preliminarily established a coupled finite element model of the human spine-hip joint complex. It predicted the altered micromechanical performance and coordinated motion characteristics of the spine and hip joint in a DDH patient compared to a normal individual. This provides a new biomechanical methodology for clinical etiological diagnosis and offers a novel approach and preliminary theoretical reference for in-depth investigation into the biomechanics of the spine-hip joint complex.
METHODS: Based on CT images from a 24-year-old male DDH patient(height:175 cm,weight:65 kg) and a healthy male volunteer,computer aided design(CAD) models of their hip joints and spines were reconstructed using a general orthopaedic method. Coupled finite element models of the spine-hip joint were established. These models were used to predict the stress,displacement in the spine and hip joints,and the postural changes of the pelvis relative to the lumbar spine during static postures(standing and sitting) and dynamic motions (walking and sit-to-stand/stand-to-sit movements).
RESULTS: The predicted ranges of motion for the normal model during spinal flexion-extension,lateral bending,and rotation were within the ranges reported in previous studies,except for a smaller lateral bending angle at L2-L3(5.5° vs. a reported minimum of 7.5°),indirectly validating the finite element model. The predicted maximum stress(1.6 MPa) on the lumbar intervertebral discs occurred at the L5-S disc,while the minimum stress (0.93 MPa) was at the L1-L2 disc,with stress increasing gradually from superior to inferior levels. During static standing and sitting,the DDH patient's spine showed significant stress concentration with higher maximum stress compared to the normal individual. During the gait cycle,the maximum spinal stress in the DDH patient (approximately 279.68 MPa) was significantly higher than that in the normal individual (255.57 MPa),but bilateral pelvic displacement was lower. During sit-to-stand/stand-to-sit motions,the hip joint stress and displacement in the DDH patient showed a trend similar to that during walking compared to the normal individual. Both motion analyses indicated that the spine-hip joint mobility in the DDH patient was lower than normal,suggesting degenerative changes in micromechanical performance.
CONCLUSION: This study preliminarily established a coupled finite element model of the human spine-hip joint complex. It predicted the altered micromechanical performance and coordinated motion characteristics of the spine and hip joint in a DDH patient compared to a normal individual. This provides a new biomechanical methodology for clinical etiological diagnosis and offers a novel approach and preliminary theoretical reference for in-depth investigation into the biomechanics of the spine-hip joint complex.