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Assessment of Reactive Synovitis in Rotating-Platform Posterior-Stabilized Design: A 10-Year Prospective Matched-Pair MRI Study


This is the first long-term (mean 11.6 years), prospective, matched-pair study (based on age, gender, BMI and UCLA scores) using MAVRIC (multi-acquisition variable-resonance image combination) magnetic resonance imaging to analyze reactive synovitis and osteolysis between rotating-platform posterior-stabilized (RP-PS), fixed-bearing metal-back (FB-MB), and all-polyethylene tibial (APT) in active patients (24 total, 8 in each group, mean age of 64 years, mean UCLA of 8.5) with identical femoral component and polyethylene. Reactive synovitis was observed in 6 RP-PS (75%), all 8 FB-MB (100%), and 6 APT (75%). There was a significant difference between the RP-PS and FB-MB knees in volumetric synovitis (P = 0.023). Osteolysis with bone loss more than 4 mm was seen in 3 FB-MB, 2 APT and none for RP-PS. These were not statistically significant.

The Journal of Arthroplasty

Volume 28, Issue 9, October 2013, Pages 1551-1555

Morteza Meftah MD, Hollis G. Potter MD, Stephanie Gold BA, Anil S. Ranawat MDAmar S. Ranawat MD, Chitranjan S. Ranawat MD

Hospital for Special Surgery, New York, New York

Received 20 November 2012, Accepted 16 January 2013, Available online 23 March 2013.