Sensitivity of knee replacement contact calculations to kinematic measurement errors

被引:34
作者
Fregly, Benjamin J. [1 ,2 ,3 ]
Banks, Scott A. [1 ,2 ,3 ]
D'Lima, Darryl D. [4 ]
Colwell, Clifford W., Jr. [4 ]
机构
[1] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA
[2] Univ Florida, Dept Orthoped & Rehabil, Gainesville, FL 32611 USA
[3] Univ Florida, Dept Biomed Engn, Gainesville, FL 32611 USA
[4] Scripps Clin, Shiley Ctr Orthopaed Res & Educ, La Jolla, CA USA
关键词
in vivo knee kinematics; elastic contact model; computational simulation; total knee arthroplasty;
D O I
10.1002/jor.20548
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
The ability to measure in vivo knee kinematics accurately makes it tempting to calculate in vivo contact forces, pressures, and areas directly from kinematic data. However, the sensitivity of contact calculations to kinematic measurement errors has not been adequately investigated. To address this issue, we developed a series of sensitivity analyses derived from a validated in vivo computational simulation of gait. The simulation used an elastic foundation contact model to reproduce in vivo contact force, center of pressure, and fluoroscopic motion data collected from an instrumented knee replacement. Treating each degree of freedom (DOF) in the simulation as motion controlled, we first quantified. how errors in measured relative pose of the implant components affected contact calculations. Pose variations of +/- 0.1 min or degree over the entire gait cycle changed maximum contact force, pressure, and area by 204, 100, and 117%, respectively. Larger variations of +/- 0.5 mm or degree changed these same quantities by 1157, 108, and 578%, respectively. In both cases, the largest sensitivities were to errors in superior-inferior translation and varus-valgus rotation, with loss of contact occurring on one or both sides. We then quantified how switching the sensitive DOFs from motion to load control affected the sensitivity results. Pose variations of +/- 0.5 min or degree in the remaining DOFs changed maximum contact quantities by at most 3%. These results suggest that accuracy oil the order of microns and milliradians is needed to estimate contact forces, pressures, and areas directly from in vivo kinematic measurements, and that use of load rather than motion control for the sensitive DOFs may improve the accuracy of in vivo contact calculations. (C) 2008 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.
引用
收藏
页码:1173 / 1179
页数:7
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