Simulation Study on Influence of Orientation Parameter of Total Hip Components on the Range of Motion of Hip at Different Head/Neck Ratios Using Computer-Assisted Model
1 The Third Affiliated Hospital of Wenzhou Medical College, Rui′an 325200,China
2 Institute of Digitized Medicine, Wenzhou Medical College, Wenzhou 325035,China
3 School of Mechanical and Power Energy Engineering, Shanghai Jiaotong University，Shanghai 200240,China
Abstract：In this study a simulation model was proposed to examine the influence of orientation parameter of total hip components on the range of hip motion and obtain optimum combination of cup and neck anteversions in total hip arthroplasty at different general head/neck ratios (GR). A threedimensional generic parametric and kinematic simulation module of total hip arthroplasty （THA） was developed. The corresponding operative anteversion (OA) of the cup was related to the operative inclination (OI) of the cup which every 5° was calculated, and described using dots and lines in a coordinate system in which OI of acetabular cup was horizontal ordinate and OA of acetabular cup was vertical ordinate. The results showed that when CCDangle was 135°, the optimum relationship between OA of acetabular (Y) and FA of normal criteria and severe criteria (X）could be estimated by the formula: Y1=0.728X1+40.916（R2=0.999 9）and Y2=-0.738 4X2+46.456(R2=0.999 9）respectively, and the minimum allowable operative inclination (OImin) of acetabular should be more than 254.27GR-3.172（R2 = 0.991 7）and 230.58GR-2.519(R2 = 0.993 5）respectively. Large GR greatly increased the range of motion of the hip and the size of cup safe-zone. The more severe of the hip motion, the smaller size of the cup safezone, but could be retrieve by increasing the GR. The minimum allowable operative inclination (OImin) of acetabular was largely reduced with an increasing GR. The OA was negative with the femoral anteversion (FA).
李永奖1 蔡春元1 林瑞新1 张力成1* 杨国敬1 周德彪1吴立军2 余斌峰1 季文婷3 . 头颈直径比与假体安装参数对髋关节活动度影响的计算机模拟研究[J]. 中国生物医学工程学报, 2012, 31(1): 103-109.
LI Yong Jiang1 CAI Chun Yuan1 LIN Rui Xin1 ZHANG Li Cheng1* YANG Guo Jing1 ZHOU De Biao1 WU Li Jun2 . Simulation Study on Influence of Orientation Parameter of Total Hip Components on the Range of Motion of Hip at Different Head/Neck Ratios Using Computer-Assisted Model. journal1, 2012, 31(1): 103-109.
