Assessment of Reactive Synovitis in Rotating-Platform Posterior-Stabilized Design: A 10-Year Prospective Matched-Pair MRI Study
Section snippets
Material and Methods
From September 1999 to October 2001, 433 TKAs were performed in 3 consecutive cohorts of patients: 126 APT, 183 FB-MB, and 124 RP-PS knees, which were included in our prospective institutional database. A total of 58 patients had University of California Los Angeles (UCLA) activity scores of 5 or above. A power analysis was performed based on our prior pilot study using MRI to measure particle burden between RP-PS and FB-MB in the same patients [25]. We calculated that 8 matched pair cohorts
Results
The mean follow-up was 11.6 ± 0.7 years (range 10.2–13). There was no significant difference in WOMAC, KSS, or UCLA activity score at final follow-up among the three groups (Table 2). All patients were satisfied with a mean satisfaction score of 8.6 ± 2.5 (range 6.5–10). Sixteen patients (89%) were still participating in recreational activity with a UCLA score of 4 or above. There was no instability on physical exam in any patient. One patient in the RP-PS group had mild effusion on examination,
Discussion
The mobile-bearing knee design was introduced more than three decades ago [32]. The rotating platform is a unidirectional posterior stabilized knee that was designed to decrease the cross-shear forces, wear and fixation failure as compared to the fixed bearing design 4., 5., 24.. Despite the results of in-vitro studies showing reduction of wear 1., 2., 3., 4., 5. and a long-term clinical report demonstrating excellent survivorship for mechanical failures in RP-PS knees [24], superiority of this
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Level of Evidence: II.
The Conflict of Interest statement associated with this article can be found at http://dx.doi.org/10.1016/j.arth.2013.01.023.