Cao L, Sun K, Wang H, et al. - In this study, the influence of patellar morphology on knee joint function and patellofemoral tracking were investigated in patients with primary osteoarthritis (OA) after total knee arthroplasty (TKA) without patellar resurfacing. Between April 2018 and July 2019, a retrospective study was conducted including a total of 156 patients with primary OA who had undergone TKA without patellar resurfacing. Researchers compared clinical data, postoperative follow-up data, and radiological data between three groups. The evidence indicates that after TKA, individuals with three different morphologic types of the patella both exhibited improved knee joint function, nevertheless, patients with Wiberg type Ⅲ patella were more prone to have poor patellofemoral tracking and anterior knee pain after surgery.