A New Technique for Measuring Wear in Total Hip Arthroplasty Using Computed Tomography

作者：Goldvasser Dov^*; Noz Marilyn E; Maguire G Q Jr; Olivecrona Henrik; Bragdon Charles R; Makhau Henrik

来源：Journal of Arthroplasty, 2012, 27(9): 1636-1640.

DOI：10.1016/j.arth.2012.03.053

• hip phantom
• polyethylene wear
• high-resolution CT scanners
• error measurement
• precision measurement

Accurately estimating polyethylene wear in 3 dimensions, without the need for additional procedures or equipment, is of significant interest. We investigated the use of a high-resolution clinical computed tomographic (CT) scanner to estimate femoral head displacement relative to the cup as an indirect method of estimating polyethylene wear. A hip phantom was used to simulate the 3-dimensional displacement of a femoral head. The phantom was imaged in a high-resolution CT scanner. The mean difference between the true phantom displacement as positioned by micrometers and the calculated displacement based on the CT images was as follows: for the x-axis, 0 mm (SD, 0.213; SE, 0.058); y-axis, 0.039 mm (SD, 0.035; SE, 0.026); and z-axis, 0.039 mm (SD, 0.051; SE, 0.020).

• 出版日期2012-10