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J Knee Surg 2021; 34(14): 1503-1509
DOI: 10.1055/s-0040-1710369
Original Article

Patellar Resurfacing Does Not Improve Clinical Outcome in Patients with Symptomatic Tricompartmental Knee Osteoarthritis. An RCT Study of 40 Patients Receiving Primary Cruciate Retaining Total Knee Arthroplasty

Tom M. van Raaij
1   Department of Orthopedic Surgery, Martini Hospital Groningen, Groningen, The Netherlands
,
Evelien van der Meij
1   Department of Orthopedic Surgery, Martini Hospital Groningen, Groningen, The Netherlands
,
Astrid J. de Vries
1   Department of Orthopedic Surgery, Martini Hospital Groningen, Groningen, The Netherlands
,
Jos J.A.M. van Raay
1   Department of Orthopedic Surgery, Martini Hospital Groningen, Groningen, The Netherlands
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Abstract

There is some evidence that patellofemoral (PF) joint osteoarthritis (OA) causes anterior knee pain (AKP) after total knee arthroplasty (TKA). We hypothesized that patellar resurfacing in primary TKA for patients with symptomatic tricompartmental knee OA yields better clinical results after 2 years than non-resurfacing. A single center randomized controlled clinical trial comparing 40 patients receiving 42 cruciate retaining TKAs with (n = 21) or without patellar resurfacing (n = 21) was conducted. Primary outcome was the specific PF joint score HSS Baldini and secondary outcomes were the Knee Society Score (KSS) and the Knee Osteoarthritis Outcome Scale (KOOS). After 2 years no significant differences between both groups and between the groups in time for HSS Baldini, KSS, and KOOS were found. HSS Baldini score improved significantly after 6 weeks in both groups (p < 0.001) and did not improve in time afterward. At final follow-up the HSS Baldini mean score improved from a preoperative mean of 39 to 88 (difference of 49 points; p < 0.001)) for without patellar resurfacing group, and from a preoperative mean of 37 to 81 for patellar resurfacing group (difference of 47 points; p < 0.001). One patient in the patellar resurfacing group underwent a soft tissue re-alignment procedure because of patellar subluxation. Two patients in without patellar resurfacing group received secondary patellar button placement. Patellar resurfacing in primary TKA for patients with symptomatic tricompartmental OA has no beneficial effect over non-resurfacing and seems unnecessary. A special PF joint outcome measurement tool (HSS Baldini) and common knee scores showed no better knee function or AKP outcomes for with patellar resurfacing over without patellar resurfacing group in time and after 2 years of follow-up.

Keywords

patella - resurfacing - knee - arthroplasty - Baldini score


Publication History

Received: 03 November 2019

Accepted: 21 March 2020

Article published online:
20 May 2020

© 2020. Thieme. All rights reserved.

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