Characteristical analysis and comparison of the high flexion movement of human normal and artificial patellofemoral joints
WANG Jian-ping, FU Long, ZHANG Yan-ru, LIANG Jun, ZHANG Pan-pan, WANG Meng
Chinese Journal of Clinical Anatomy ›› 2016, Vol. 34 ›› Issue (4) : 432-438.
Characteristical analysis and comparison of the high flexion movement of human normal and artificial patellofemoral joints
Objective The purpose of this work was to analyze the kinematics of the human normal and artificial patellofemoral joints during squat. Reference for the study of the patellofemoral joint kinematics of the knee was provided. Method Dynamic finite element (FE) models of knee before and after total knee arthroplasty (TKA), which included the bone tissues and main soft tissues were developed in this research, to simulate the kinematics of patellofemoral joint during squat by the way of three beams quadriceps femoris myodynamia being asynchronously loaded, and were compared with related researches. Result The dynamic 3D relative movement data of patellofemoral joint during deep flexion were obtained. The results showed that the relative motion of the nature knee were similar to that of the TKA knee. At the same time, there has partial difference, in low flexion the TKA knee showed lateral tilt and then medial tilt, but the normal knee showed continued medial tilt. Conclusions Through simulation and comparative analysis, in general, patellofemoral joint kinematics data were approximate. And there was a difference for the normal knee, and the main reason for the difference was the changes of the degree of restraint of the knee patella in each direction and different degrees of flexion; for the artificial knee, the main reasons for the difference were the change of the profile and structure of the knee, simultaneously, related to the difference of the definition of the coordinate system, in vivo and in vitro, and the way of load being loaded.
Patellofemoral joint / Dynamic FE model / Asynchronousinotropism loads / Relative kinematics / Comparative analysis
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