Radiographic wear assessment in a total knee prosthesis. 5- to 9-year follow-up study of 158 knees
Research output: Contribution to journal › Article
One hundred fifty-eight Porous-Coated Anatomic (Howmedica, Rutherford, NJ) primary total knee prostheses were evaluated clinically and radiographically to measure the remaining thickness of the plastic insert. Anteroposterior radiographs were taken with the beam guided parallel to the tibial plate by a fluoroscope. The knees were forced into varus and valgus, and the heights of the medial and lateral joint spaces, respectively, were measured with a digitizing table. Plastic insert wear could be calculated after correction with a magnification error factor, established by dividing the projected width of the tibial plate by the true size of the used component. After a mean follow-up period of 84 months (range, 58-116 months), wear was significantly higher for patients with osteoarthritis than rheumatoid arthritis and was 1.4 mm versus 0.7 mm medially (P < .0001) and 0.7 mm versus 0.4 mm laterally (P = .01). Wear was not correlated to thickness of the plastic insert or length of follow-up period. Young age or varus alignment contributed slightly to the amount of wear.
|Research areas and keywords||
Subject classification (UKÄ) – MANDATORY
|Journal||Journal of Arthroplasty|
|Publication status||Published - 1996|
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Diagnostic Radiology, (Lund) (013038000), Reconstructive Surgery (013240300), Clinical and Molecular Osteoporosis Research Unit (013242930)