摘要
[目的]采用三维有限元方法对比分析不同髌骨解剖类型间髌股关节应力分布的差异。[方法]根据Wiberg髌骨解剖分型方法,选取髌骨解剖形态为Ⅱ、Ⅲ型健康青年男性志愿者各1例,获取其膝关节磁共振图像,应用Mimics软件提取髌股关节轮廓曲线,再经AutoCAD软件及SolidWorks软件对曲面进行反求拟合、修整装配,生成了表面光滑的髌股关节骨软骨三维实体模型,并应用ABAQUS软件定义各部件材料力学属性、网格划分后,进行髌股关节应力分析对比研究。[结果]本研究基于活体髌股关节矢状位二维FLASH序列MRI图像,通过手工提取髌股关节骨、软骨轮廓,并利用AutoCAD软件对其进行精确的修整与装配,定义材料力学属性及网格化分后,成功构建了相应的Ⅱ、Ⅲ型髌股关节骨、软骨三维有限元模型。在屈膝30°状态下,股四头肌肌力200 N时,Ⅱ型髌骨髌股关节接触面最小应力0.138 MPa,峰值应力2.364 MPa,平均应力1.018 MPa;应力较均匀分布于髌股关节接触面的内侧、中央、外侧面的广泛区域;Ⅲ型髌骨髌股关节接触面最小应力0.209 MPa,峰值应力2.509 MPa,平均应力1.347 MPa;应力分布不均匀,主要集中于外侧髌股关节面。[结论]Ⅲ型髌骨因其解剖形态对称性较Ⅱ型髌骨下降,容易导致相应髌股关节的异常应力分布,并可能是导致软骨损伤及骨性关节炎的重要病因。
[ Objective] To compare the stress distribution in patellofemoral joint between type Ⅱand type m patella with the three dimensional finite element method. [ Method] The knee MR images were collected from two healthy young male volun- teers with type type H and type Ⅲpatella according to the Wiberg classification. Three - dimensional finite element models of the type - Ⅱ, Ⅲtype of the patellofemoral anatomy classificaion were built based on in vivo magnetic resonance imaging （MRI） data. Then the stress distribution with 30 o knee flexion between the two patellofemoral anatomical types was compared by finite element mathematical model through Mimics,AutoCAD software and SolidWorks softwares. [ Result] Patellofemoral three- di- mensional finite element models of its bone and cartilage about the type - Ⅱ, Ⅲof the patellofemoral anatomy classification were established based on the in vivo patellofemoral sagittal MR images of two - dimensional fast low angle shot （FLASH） se- quence by the manual extraction of the patellofemoral joint bone, cartilage contour and the use of Mimics, AutoCAD and Solid- Works software for precise assembly, meshing and define the characters of material and mechanics. Finite element analysis showed：In the state of 30°knee flexion and 200 N quadriceps strength,for the type Ⅱ patella, the patellofemoral stress was e- venly distributed with the minimum stress 0. 138 MPa, the maximum stress 2. 364 MPa and the average stress 1. 018 MPa, for the type m patella, the patellofemoral stress was unevenly distributed in the lateral surfaces with the minimum stress 0. 209 MPa,the maximum stress 2. 509 MPa and the average stress 1. 347 MPa. [ Conclusion] In contrast to the symmetric typeⅡ pa- tella, the type Ⅲ is asymmetrical, which is an important pathogenesis for the abnormal patellofemoral stress distribution, patel- lofemoral cartilage lesion and patellofemoral osteoarthritis.
出处
《中国矫形外科杂志》
CAS
CSCD
北大核心
2014年第4期352-358,共7页
Orthopedic Journal of China
基金
国家自然科学基金资助项目(编号:11302248)
关键词
髌股关节
三维有限元
解剖类型
生物力学
patellofemoral joint, three dimensional finite element, anatomical classification, biomechanics
