BACKGROUND Subchondral fatigue fracture of the femoral head(SFFFH)mainly occurs in young military recruits and might be confused with osteonecrosis of the femoral head.However,less research focuses on the risk factor ...BACKGROUND Subchondral fatigue fracture of the femoral head(SFFFH)mainly occurs in young military recruits and might be confused with osteonecrosis of the femoral head.However,less research focuses on the risk factor for SFFFH.AIM To evaluate the intrinsic risk factors for SFFFH in young military recruits.METHODS X-ray and magnetic resonance imaging data were used for analysis.Acetabular anteversion of the superior acetabulum,acetabular anteversion of the center of the acetabulum(AVcen),anterior acetabular sector angle(AASA),posterior acetabular sector angle,superior acetabular sector angle,neck-shaft angle(NSA),inferior iliac angle(IIA),and ischiopubic angle were calculated.Then,logistic regression,receiver operating characteristic curve analysis,and independent samples t-test were performed to identify the risk factors for SFFFH.RESULTS Based on the results of logistic regression,age[odds ratio(OR):1.33;95%confidence interval(95%CI):1.12-1.65;P=0.0031]and treatment timing(OR:0.86;95%CI:0.75-0.96;P=0.015)could be considered as the indicators for SFFFH.AVcen(P=0.0334),AASA(P=0.0002),NSA(P=0.0007),and IIA(P=0.0316)were considered to have statistical significance.Further,AVcen(OR:1.41;95%CI:1.04-1.95)and AASA(OR:1.44;95%CI:1.21-1.77),especially AASA(area under curve:66.6%),should be paid much more attention due to the higher OR than other indicators.CONCLUSION We have for the first time unveiled that AASA and age could be key risk factors for SFFFH,which further verifies that deficient anterior coverage of the acetabulum might be the main cause of SFFFH.展开更多
目的建立股骨头坏死(osteonecrosis of the femoral head,ONFH)不同保留角有限元模型进行生物力学分析,为以股骨头前侧保留角(anterior preserved angle,APA)和外侧保留角(lateral preserved angle,LPA)预测ONFH塌陷风险提供力学依据。...目的建立股骨头坏死(osteonecrosis of the femoral head,ONFH)不同保留角有限元模型进行生物力学分析,为以股骨头前侧保留角(anterior preserved angle,APA)和外侧保留角(lateral preserved angle,LPA)预测ONFH塌陷风险提供力学依据。方法选择1名健康成人左侧股骨头为研究对象,获取CT数据导入Mimics21.0软件,重建完整股骨近端模型以及构建3个体积相等、形态不同的ONFH模型,导入Solidworks 2022软件中分别构建APA为60°且LPA分别为45°、50°、55°、60°、65°、70°、75°的21个ONFH有限元模型,以及LPA为60°且APA分别为45°、50°、55°、60°、65°、70°、75°的21个ONFH有限元模型。根据生理状态下股骨头负荷情况,股骨远端设置完全固定,在股骨头表面负重区施加与股骨干成25°夹角、方向向下且大小为受试者3.5倍体质量的合力,利用有限元分析软件Abaqus 2021计算并观察股骨头表面、坏死区最大应力及股骨头负重区最大位移情况。结果研究建立的ONFH模型基本符合ONFH力学情况。在相同载荷条件下,3个不同形态相同体积的坏死区构成的42个ONFH不同保留角模型中,坏死区周围均有应力集中现象。APA为60°时,LPA<60°模型的股骨头表面、坏死区最大应力和股骨头负重区最大位移明显高于LPA≥60°模型(P<0.05);LPA≥60°模型间的各指标差异无统计学意义(P>0.05)。LPA为60°时,APA<60°模型的各指标明显高于APA≥60°模型(P<0.05);APA≥60°模型间的各指标差异无统计学意义(P>0.05)。结论从生物力学角度来看,当ONFH保留角小于临界值时,股骨头应力集中现象更为明显,提示此种状态下坏死股骨头发生塌陷风险更高。展开更多
文摘BACKGROUND Subchondral fatigue fracture of the femoral head(SFFFH)mainly occurs in young military recruits and might be confused with osteonecrosis of the femoral head.However,less research focuses on the risk factor for SFFFH.AIM To evaluate the intrinsic risk factors for SFFFH in young military recruits.METHODS X-ray and magnetic resonance imaging data were used for analysis.Acetabular anteversion of the superior acetabulum,acetabular anteversion of the center of the acetabulum(AVcen),anterior acetabular sector angle(AASA),posterior acetabular sector angle,superior acetabular sector angle,neck-shaft angle(NSA),inferior iliac angle(IIA),and ischiopubic angle were calculated.Then,logistic regression,receiver operating characteristic curve analysis,and independent samples t-test were performed to identify the risk factors for SFFFH.RESULTS Based on the results of logistic regression,age[odds ratio(OR):1.33;95%confidence interval(95%CI):1.12-1.65;P=0.0031]and treatment timing(OR:0.86;95%CI:0.75-0.96;P=0.015)could be considered as the indicators for SFFFH.AVcen(P=0.0334),AASA(P=0.0002),NSA(P=0.0007),and IIA(P=0.0316)were considered to have statistical significance.Further,AVcen(OR:1.41;95%CI:1.04-1.95)and AASA(OR:1.44;95%CI:1.21-1.77),especially AASA(area under curve:66.6%),should be paid much more attention due to the higher OR than other indicators.CONCLUSION We have for the first time unveiled that AASA and age could be key risk factors for SFFFH,which further verifies that deficient anterior coverage of the acetabulum might be the main cause of SFFFH.
