Accuracy and precision of radio stereometric analysis in the measurement of THR femoral component translations:: human and canine in vitro models

被引:51
作者
Önsten, I
Berzins, A
Shott, S
Sumner, DR
机构
[1] Rush Med Coll, Rush Presbyterian St Lukes Med Ctr, Dept Anat, Chicago, IL 60612 USA
[2] Rush Med Coll, Rush Presbyterian St Lukes Med Ctr, Dept Orthoped Surg, Chicago, IL 60612 USA
[3] Rush Med Coll, Rush Presbyterian St Lukes Med Ctr, Dept Obstet & Gynecol, Chicago, IL 60612 USA
[4] Malmo Univ Hosp, Dept Orthopaed, Malmo, Sweden
关键词
Bone - Hip prostheses - Micrometers - Regression analysis;
D O I
10.1016/S0736-0266(01)00039-0
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
Radiostereometric analysis (RSA) is used to measure translations of joint replacement components with respect to the host bone in vivo. We used two cadaveric models of hip arthroplasty, one human and one canine, to evaluate the accuracy and precision of RSA-based estimates of translations of the femoral component with respect to the femur under ideal conditions. The femoral components were attached rigidly to a micrometer stage that provided standard displacements in increments of 25 and 50 mum in the interval from zero to 500 mum along three orthogonal axes. Radiostereometric examinations were performed for each increment. Accuracy was calculated as the 95% prediction intervals from regression analyses between the measured and actual displacements. Precision was evaluated as the standard deviation of five repeated measurements of a 200 mum displacement along each axis. Both accuracy and precision were best along the longitudinal axis, with a prediction interval of +/- 47 mum in the human model and +/- 45 mum in the canine model and a standard deviation of 30 mum in the human model and 40 mum in the canine model. The use of only the prosthetic head as a landmark (as opposed to three markers placed on the femoral stem) led to a 3-fold larger prediction interval in the human model and a 2-fold greater prediction interval in the canine model. (C) 2001 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1162 / 1167
页数:6
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