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- Title
Measuring polyethylene wear in total knee arthroplasty by RSA: Differences between weight-bearing and non-weight-bearing positioning.
- Authors
van IJsseldijk, Emiel A.; Valstar, Edward R.; Stoel, Berend C.; de Ridder, Ruud; Nelissen, Rob G. H. H.; Kaptein, Bart L.
- Abstract
ABSTRACT Measuring the minimum-joint-space-width (mJSW) in total knee arthroplasty (TKA) in Roentgen stereophotogrammetric analysis (RSA) provides valuable information on polyethylene wear, a leading cause for TKA failure. Most existing studies use non-weight-bearing (NWB) patient positioning. The latter may compromise mJSW measurements due to knee laxity with subsequent non-contact between the TKA components. We investigated the difference in mJSW between weight-bearing (WB) and NWB images and the association with mediolateral (ML) knee stability. At one-year follow-up, 23 TKAs were included from an ongoing RSA study, and ML stability was evaluated. For each examination, the mJSW and femoral-tibial contact locations were measured. A linear regression model was used to analyze the association between the mJSW difference (NWB-WB) with the ML stability and contact locations. The mean mJSW difference was 0.28 mm medially and 0.20 mm laterally. Four TKAs had medium (5-9°) and 19 TKAs had high (<5°) ML stability. A higher mJSW difference was found for TKAs with medium stability (0.36 mm, P = 0.01). In conclusion, mJSW measurements in existing (NWB) RSA studies are influenced by knee laxity, but may still provide information on wear progression based on TKA with high ML stability. A direct comparison of mJSW measurements from WB and NWB data is not possible. © 2014 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 32:613-617, 2014.
- Subjects
POLYETHYLENE; ARTHROPLASTY; KNEE surgery; MEDICAL photography; PHOTOGRAMMETRY; PATIENT positioning; REGRESSION analysis
- Publication
Journal of Orthopaedic Research, 2014, Vol 32, Issue 4, p613
- ISSN
0736-0266
- Publication type
Article
- DOI
10.1002/jor.22579