PDF(Pubmed)
Abstract：
BACKGROUND: Developmental dysplasia of the hip causes secondary osteoarthritis. Finite element analysis suggests high hip joint contact pressure in patients with hip dysplasia and a reduction in contact pressure after periacetabular osteotomy. However, few biomechanical studies have examined the load distribution in the hip joint. This study aimed to investigate the biomechanical properties of load distribution in porcine hip joints at different acetabular coverages.
METHODS: Six porcine hip joints were analyzed using three models: 1) neutral coverage, 2) 15° under-coverage (defined as dysplasia model), and 3) 15° over-coverage created by varying the acetabular coverage. The load distribution was assessed using a pressure-mapping sensor system after applying a loading force of 100 N to the hip joint.
RESULTS: In the dysplasia model, the load was concentrated at the acetabular rim; in the neutral and over-coverage models, it was dispersed. The average contact pressure was significantly higher in the dysplasia model than in the neutral coverage model ([0.42 vs. 0.3 MPa]; p = 0.004). The contact area was significantly smaller in the dysplasia model than in the neutral coverage model ([250.7 vs. 345.0 mm2]; p = 0.004). No significant differences were observed in contact pressure or area between the neutral and over-coverage models.
CONCLUSIONS: Insufficient acetabular coverage in the dysplasia model demonstrated higher contact pressure and smaller contact area than the neutral model. Conversely, the contact pressure and area in the over-coverage model did not differ significantly from those in the normal model. Therefore, surgeons should note that acetabular coverage overcorrection has limited effect; normalization is crucial during periacetabular osteotomy.
METHODS: Six porcine hip joints were analyzed using three models: 1) neutral coverage, 2) 15° under-coverage (defined as dysplasia model), and 3) 15° over-coverage created by varying the acetabular coverage. The load distribution was assessed using a pressure-mapping sensor system after applying a loading force of 100 N to the hip joint.
RESULTS: In the dysplasia model, the load was concentrated at the acetabular rim; in the neutral and over-coverage models, it was dispersed. The average contact pressure was significantly higher in the dysplasia model than in the neutral coverage model ([0.42 vs. 0.3 MPa]; p = 0.004). The contact area was significantly smaller in the dysplasia model than in the neutral coverage model ([250.7 vs. 345.0 mm2]; p = 0.004). No significant differences were observed in contact pressure or area between the neutral and over-coverage models.
CONCLUSIONS: Insufficient acetabular coverage in the dysplasia model demonstrated higher contact pressure and smaller contact area than the neutral model. Conversely, the contact pressure and area in the over-coverage model did not differ significantly from those in the normal model. Therefore, surgeons should note that acetabular coverage overcorrection has limited effect; normalization is crucial during periacetabular osteotomy.
摘要：
背景：发育性髋关节发育不良会导致继发性骨关节炎。有限元分析提示髋关节发育不良患者髋关节接触压力高，髋臼周围截骨术后接触压力降低。然而,很少有生物力学研究检查了髋关节的负荷分布。本研究旨在研究不同髋臼覆盖率下猪髋关节负荷分布的生物力学特性。
方法：使用三种模型分析了六个猪髋关节：1）中性覆盖，2)15°覆盖不足(定义为发育不良模型)，和3)通过改变髋臼覆盖产生的15°过覆盖。在向髋关节施加100N的载荷力后，使用压力映射传感器系统评估载荷分布。
结果：在发育不良模型中，负荷集中在髋臼边缘；在中性和过度覆盖模型中，它被分散了。发育不良模型的平均接触压力明显高于中性覆盖模型([0.42vs.0.3MPa];p=0.004)。发育不良模型的接触面积明显小于中性覆盖模型([250.7vs.345.0mm2]；p=0.004）。中性和过覆盖模型之间的接触压力或面积没有观察到显着差异。
结论：与中性模型相比，发育不良模型的髋臼覆盖不足表现出更高的接触压力和更小的接触面积。相反，过度覆盖模型中的接触压力和面积与正常模型中的没有显著差异.因此,外科医生应注意，髋臼覆盖过度矫正效果有限；髋臼周围截骨术的正常化至关重要。
方法：使用三种模型分析了六个猪髋关节：1）中性覆盖，2)15°覆盖不足(定义为发育不良模型)，和3)通过改变髋臼覆盖产生的15°过覆盖。在向髋关节施加100N的载荷力后，使用压力映射传感器系统评估载荷分布。
结果：在发育不良模型中，负荷集中在髋臼边缘；在中性和过度覆盖模型中，它被分散了。发育不良模型的平均接触压力明显高于中性覆盖模型([0.42vs.0.3MPa];p=0.004)。发育不良模型的接触面积明显小于中性覆盖模型([250.7vs.345.0mm2]；p=0.004）。中性和过覆盖模型之间的接触压力或面积没有观察到显着差异。
结论：与中性模型相比，发育不良模型的髋臼覆盖不足表现出更高的接触压力和更小的接触面积。相反，过度覆盖模型中的接触压力和面积与正常模型中的没有显著差异.因此,外科医生应注意，髋臼覆盖过度矫正效果有限；髋臼周围截骨术的正常化至关重要。
