Posterior-stabilized Arthroplasty Versus Cruciate-retaining Arthroplasty in Treatment of Osteoarthritis: a 5-year Follow-up Study

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Backgroud: A prospective cohort study was performed to compare clinical outcomes between cruciate-retaining (CR) and posterior-stabilized (PS) arthroplasty.Methods: In total, 210 patients (210 knees) underwent CR arthroplasty (n=102) and PS arthroplasty (n=108) from January 2014 to January 2015. The Knee Society Score (KSS), range of motion, patellar stability, and complications were compared between the CR and PS groups 5 years postoperatively. Results: The CR group comprised 99 knees and the PS group comprised 105 knees at the 5-year follow-up. In the CR and PS groups, the mean postoperative KSS improved to 90±5 and 91±4, and the function score improved to 87±4 and 84±6, respectively (p>0.05). The mean postoperative range of motion was −2°±3° extension to 114°±8° flexion in the CR group and −2°±4° extension to 126°±7° flexion in the PS group, with no significant difference (p>0.05). In terms of patellofemoral complications, eight patients had patellar clunk syndrome, one had patellar subluxation, and one had patellar lateral facet fracture in the PS group. Three patients had patellar clunk syndrome, and one had symptomatic subluxation in the CR group. These patellofemoral complications were significantly different between the groups (p<0.05).Conclusions: CR and PS TKA can achieve good clinical outcomes with respect to the KSS. Better knee flexion but more patella complications in the PS arthroplasty than CR group 5 years postoperatively.Trail registration: This study was approved by our hospital institutional ethics committee.