الفهرس 
Anatomy and BiomechanicsOnly 14 pages are availabe for public view
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Abstract
Purpose: The aim of this comparative clinical study is to evaluate the different effects of patellar resurfacing and patelloplasty in total knee arthroplasty and to explore the superiority of one technique over the other one.
Methods: Patients with knee osteoarthritis (OA) or rheumatoid arthritis (RA) underwent TKA using posterior stabilized Nexgen TKA system. They were randomly allocated into two groups pre-operatively either resurfacing group (I) (25 knees) or non-resurfacing group (II) (25 knees). Patelloplasty was performed in group (II). Evaluations were done preoperatively and after 1, 3, 6 and 12 months using knee society sore (KSS), Bartlett patellofemoral score and radiological evaluation.
Results: no difference in the clinical KSS and Bartlett patellofemoral scores, although there was significant difference in the functional KSS especially stair climbing in the favor of resurfacing group. Six knees (24%) with and 4 knees (16%) without patellar resurfacing had anterior knee pain (AKP) related to the patellofemoral joint (PFJ). The reoperation rate related to the PFJ was the same in both groups 4% (n = 1). In the 9 patients who underwent bilateral TKA with patellar resurfacing on only one side, there were no significant differences between the two sides in the measured scores.
Conclusions: the short term results of the studied implant design indicates higher functional KSS in the resurfaced group but we couldn’t provide clear evidence that resurfacing is superior than patelloplasty because postoperative AKP was higher in the resurfaced group and the reoperation rate was the same in both group (one case in each group). Also surgical technique and component design are important factors in the function of the PFJ.
Level of evidence: therapeutic, pilot, comparative, randomized clinical study.