Similar patient-reported outcomes and performance after total knee arthroplasty with or without patellar resurfacing

Background and purpose — Knee pain after total knee arthro- plasty (TKA) is not uncommon. Patellar retention in TKA is one cause of postoperative knee pain, and may lead to secondary addition of a patellar component. Patellar resurfacing in TKA is controversial. Its use ranges from 2% to 90% worldwide. In this randomized study, we compared the outcome after patellar resur- facing and after no resurfacing. Patients and methods — We performed a prospective, ran- domized study of 74 patients with primary osteoarthritis who underwent a Triathlon CR TKA. The patients were randomized to either patellar resurfacing or no resurfacing. They fi lled out the VAS pain score and KOOS questionnaires preoperatively, and VAS pain, KOOS, and patient satisfaction 3, 12, and 72 months postoperatively. Physical performance tests were performed pre- operatively and 3 months postoperatively. Results — We found similar scores for VAS pain, patient sat- isfaction, and KOOS 5 subscales at 3, 12, and 72 months post- operatively in the 2 groups. Physical performance tests 3 months postoperatively were also similar in the 2 groups. No secondary resurfacing was performed in the group with no resurfacing during the fi rst 72 months Interpretation — Patellar resurfacing in primary Triathlon CR TKA is of no advantage regarding pain, physical performance, KOOS 5 subscales, or patient satisfaction compared to no resur- facing. None of the patients were reoperated with secondary addi- tion of a patellar component within 6 years. According to these results, routine patellar resurfacing in primary Triathlon TKA appears to be unnecessary.