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. 2022 Dec 19:93:914-921.
doi: 10.2340/17453674.2022.5672.

Early migration in unicompartmental knee arthroplasty: a radiostereometric study of 26 patients with 24 months of follow-up

Jantsje H Pasma  1 , Brechtje Hesseling  2 , Nicole De Esch  2 , Hennie Verburg  2 , Dieu D Niesten  2 , Nina M C Mathijssen  2
Affiliations

Early migration in unicompartmental knee arthroplasty: a radiostereometric study of 26 patients with 24 months of follow-up

Jantsje H Pasma et al. Acta Orthop. .

Abstract

Background and purpose: Aseptic loosening, mainly caused by migration, is one of the most common indications for revisions in unicompartmental knee arthroplasty (UKA). In this study, we investigated the early migration of the Persona Partial Knee (PPK, Zimmer Biomet, Warsaw, IN), a cemented medial fixed-bearing unicompartmental knee prosthesis, and evaluated the clinical results.

Patients and methods: 26 primary PPKs were implanted. Radiographs were obtained direct postoperatively, at 6 weeks, 6, 12 and 24 months postoperatively. Migration of the femoral and tibial component was calculated using model-based radiostereophotogrammetric analysis (mRSA) in terms of translations and rotations. Patient-reported outcome measures (PROMs) were also registered.

Results: At 24 months postoperatively, we found low migration of both the femoral and tibial component in the first 6 months, after which both components stabilized. Only the rotation of the tibial component about the z-axis did not stabilize. All PROMs improved after 24 months compared with preoperative PROMs.

Conclusion: The Persona Partial Knee shows low migration of both the femoral and tibial component and PROMs were improved at 24 months follow-up. Long-term follow-up is needed to investigate the performance of the prosthesis compared with other prostheses.

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Figures

Figure 1
Figure 1
Flow diagram of patient inclusion and follow-up.
Figure 2
Figure 2
Clinical evaluation presented by the mean (SD) range of motion and median (range) Knee Society Score (KSS), the latter due to non-normality.
Figure 3
Figure 3
Patient-reported outcome measures presented by the Oxford Knee Score (OKS), Knee injury and Osteoarthritis Outcome Score (KOOS-PS), numeric rating scale (NRS) pain at rest and during movement, the EQ-5D-5L, and the EQ-5D VAS. Data is presented as mean (SD) except for EQ-5D due to non-normality.
Figure 4
Figure 4
Migration results for both the femoral and tibial component over 2 years presented by the translation along the x-axis (blue), y-axis (red), and z-axis (green), rotations about the x-axis (blue), y-axis (red), and z-axis (green), and the maximum total point motion (MTPM). Data is presented as mean (SD).except for MTPM due to non-normality.
See this image and copyright information in PMC

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