Patellar Resurfacing in Total Knee Arthroplasty : A Prospective, Randomized Trial

• Published in: Journal of bone and joint surgery. American volume Vol. 84; no. 2; pp. 187 - 193
• Main Authors: Wood, David J, Smith, Anne J, Collopy, Dermot, White, Bruce, Brankov, Boris, Bulsara, Max K
• Format: Journal Article
• Language: English
• Published: Boston, MA Copyright by The Journal of Bone and Joint Surgery, Incorporated 01-02-2002; Journal of Bone and Joint Surgery Incorporated
• Subjects: Aged; Arthroplasty, Replacement, Knee - methods; Biological and medical sciences; Double-Blind Method; Female; Follow-Up Studies; Humans; Knee; Male; Medical sciences; Orthopedic surgery; Osteoarthritis - surgery; Pain - etiology; Patella - surgery; Prospective Studies; Reoperation; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Treatment Outcome; Knee; Human; Postoperative; Prognosis; Indication; Prosthesis; Resurfacing; Femoropatellar joint; Orthopedic surgery; Treatment; Follow up study; Patella; Total; Complication; Technique
• ISSN: 0021-9355; 1535-1386
• DOI: 10.2106/00004623-200202000-00004

BackgroundThe management of the patella in total knee arthroplasty is still problematic. We aimed to identify differences in the clinical outcome of total knee arthroplasty according to whether or not patellar resurfacing had been performed in a prospective, randomized study of 220 osteoarthritic knees.MethodsTwo hundred and twenty total knee arthroplasties in 201 patients were randomly assigned to be performed with either resurfacing or retention of the patella, and the results were followed for a mean of forty-eight months (range, thirty-six to seventy-nine months) in a double-blind (both patient and clinical evaluator blinded), prospective study. Evaluation was performed annually by an independent observer and consisted of assessment with the Knee Society clinical rating system, specific evaluation of anterior knee pain, a stair-climbing test, and radiographic examination.ResultsFifteen (12%) of the 128 knees without patellar resurfacing and nine (10%) of the ninety-two knees with patellar resurfacing underwent a revision or another type of reoperation related to the patellofemoral articulation. This difference was not significant (chi square with one degree of freedom = 0.206, p = 0.650). At the time of the latest follow-up, there was a significantly higher incidence of anterior pain (chi square with one degree of freedom = 5.757, p = 0.016) in the knees that had not had patellar resurfacing.ConclusionsPatients who underwent patellar resurfacing had superior clinical results in terms of anterior knee pain and stair descent. However, anterior knee pain still occurred in patients with patellar resurfacing, and nine (10%) of the ninety-two patients in that group underwent a revision or another type of reoperation involving the patellofemoral joint. Weight but not body mass index was associated with the development of anterior knee pain in the patients without patellar resurfacing, a finding that suggests that patellofemoral dysfunction may be a function of joint loading rather than obesity.