Abstract
Aims A retrospective study was conducted to measure short-term in vivo linear and volumetric wear of polyethylene (PE) inserts in 101 total knee arthroplasty (TKA) patients using model-based radiostereometric analysis (MBRSA). Patients and Methods Nonweightbearing supine RSA exams were performed postoperatively and at six, 12, and 24 months. Weightbearing standing RSA exams were performed on select patients at 12 and 24 months. Wear was measured both linearly (joint space) and volumetrically (digital model overlap) at each available follow-up. Precision of both methods was assessed by comparing double RSA exams. Patient age, sex, body mass index, and Oxford Knee Scores were analyzed for any association with PE wear. Results Linear wear occurred at 0.015 mm/year (supine) and 0.220 mm/year (standing). Volumetric wear occurred at 10.3 mm3/year (supine) and 39.3 mm3/year (standing). Wear occurred primarily on the medial side of the joint. Weightbearing imaging greatly improved the reliability of measurement. Clinical precision of volumetric wear was 34 mm3. No significant associations were found between patient demographics or function scores and measured wear. Conclusion In vivo volumetric wear of TKAs can be assessed at short-term follow-up using MBRSA.
| Original language | English |
|---|---|
| Pages (from-to) | 1348-1355 |
| Number of pages | 8 |
| Journal | Bone and Joint Journal |
| Volume | 101-B |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2019 |
Bibliographical note
Funding Information:T. Gascoyne, S. Parashin, E. Bohm, and T. Turgeon report an institutional grant (paid to Concordia Joint Replacement Group) from the University of Manitoba, related to this study. M. Dunbar reports an institutional grant (paid to Dalhousie University and Nova Scotia Health Authority) from the Nova Scotia Health Authority Research Fund, related to this study.
Funding Information:
E. Laende reports an institutional grant (paid to Dalhousie University and Nova Scotia Health Authority) from DePuy Synthes, via the Canadian RSA Network, related to this study. M. Dunbar reports institutional grants (paid to Dalhousie University and Nova Scotia Health Authority) from Wright Medical and Zimmer, related to this study. M. Dunbar also reports personal consultancy fees, royalties, and an institutional grant (paid to Dalhousie University and Nova Scotia Health Authority) from Stryker, all unrelated to this study. Computer models of the implants were received from Stryker for this work, and were directed to a research fund held by the Orthopaedic Innovation Centre’s hospital foundation.
Funding Information:
This study was approved by the University of Manitoba Research Ethics Board (H2014:035).
Funding Information:
T. Gascoyne, S. Parashin, E. Bohm, and T. Turgeon report an institutional grant (paid to Concordia Joint Replacement Group) from the University of Manitoba, related to this study. M. Dunbar reports an institutional grant (paid to Dalhousie University and Nova Scotia Health Authority) from the Nova Scotia Health Authority Research Fund, related to this study. Although none of the authors has received or will receive benefits for personal or professional use from a commercial party related directly or indirectly to the subject of this article, benefits have been or will be received but will be directed solely to a research fund, foundation, educational institution, or other non- profit organization with which one or more of the authors are associated.
Publisher Copyright:
©2019 The British Editorial Society of Bone & Joint Surgery.
ASJC Scopus Subject Areas
- Surgery
- Orthopedics and Sports Medicine