摘要
目的使用有限元分析内固定术治疗股骨颈骨折后前倾角变化对股骨近端力学产生的影响,为股骨颈骨折内固定治疗的有效性提供重要依据。方法 2015年5~8月,选择1名男性志愿者,身体健康,使用16层螺旋CT对该志愿者的髋关节进行扫描,获取数据,在CAD软件和三维重建软件的基础上,以股骨近端为目标,结合有限元分析建立Pauwells角是70°的三维模型,该模型中股骨颈骨折接受内固定术后的前倾角度数分别是0°、10°、20°,然后将人体缓慢行走时应承受的约束力和应承载的负荷附加到该三维模型上,观察不同模型间股骨近端的应力分布情况。结果当前倾角为10°时,股骨近端承受的最大应力值是200 MPa,位移是1.2 mm,随着前倾角增大或者减小,股骨端承受的应力和位移也会随之增大。结论在股骨颈骨折的内固定术中,帮助患者恢复前倾角对患者术后康复异常重要,可明显抑制术后患者出现股骨头坏死。
Objective To analyze the mechanical effect of anteversion change on proximal femur after internal fixation of femoral neck fracture by finite element and to provide important basis for the effectiveness of internal fixation treatment of femoral neck fracture. Methods From May to August 2015,1 healthy male volunteer was selected and 16 slice spiral CT was used to scan the hip joint of the volunteer to get data.With finite element analysis and taking proximal femur as target,3D model with Pauwells angle of 70° was established using software of CAD and three-dimensional reconstruction based on the data collected,in which the angle of anteversion after internal fixation of femoral neck fracture was 0°,10°,and 20° respectively.Then the nominal constraining force and burden during slow walk were added to the 3D model and the stress distribution of proximal femur in different model was observed. Results When the anteversion angle was 10°,the maximum stress that the proximal femur could load was 200 MPa,and the displacement was 1.2 mm.Along with the increase or decrease of the anteversion,the stress and displacement loaded by the proximal femur would increase.Conclusion Reconstruction of the anteversion angle is critical in the postoperative rehabilitation of patients after internal fixation of femoral neck fracture,which can evidently inhibit postoperative patients with femoral head necrosis.
出处
《中国当代医药》
2016年第1期107-109,112,共4页
China Modern Medicine
关键词
股骨颈骨折
内固定术
前倾角变化
力学影响
有限元分析
Femoral neck fracture
Internal fixation
Anteversion change
Mechanics effect
Finite element analysis
