Burger JA, Dooley MS, Kleeblad LJ, et al. - This research was undertaken to investigate of preoperative radiological degenerative changes and alignment on patient-reported outcome scores (PROMs) after lateral unicompartmental knee arthroplasty (UKA) and to evaluate the effect of lateral UKA on the alignment of the patellofemoral joint. Researchers retrospectively examined a consecutive series of patients who had undergone robotic arm-assisted fixed-bearing lateral UKA with at least two-year follow-up. They performed radiological assessment to obtain a Kellgren Lawrence (KL) grade, an Altman score, and alignment measurements for each knee. They evaluated postoperative PROMs applying the Kujala (Anterior Knee Pain Scale) score, Knee Injury and Osteoarthritis Outcome Score Joint Replacement, and satisfaction levels. They distinguished a sum of 140 knees (130 patients) for analysis. This is the first research highlighting that mild to moderate preoperative radiological degenerative differences and malalignment of the patellofemoral joint are not correlated with poor patient-reported outcomes at mid-term follow-up after lateral fixed-bearing UKA. The data imply that this may be explained by realignment of the patella and thereby redistribution of loads across the patellofemoral joint.