Crawford DA, Lapsley L, Hurst JM, et al. - This study was intended to assess if polyethylene thickness in medial mobile-bearing unicondylar arthroplasty (UKA) impacts clinical outcomes and survivorship. Between 2004 and 2017, researchers conducted a retrospective review that identified patients who had undergone a primary mobile bearing medial UKA with a 2-year minimum follow-up or revision. The study population comprised a total of 2,305 patients (3030 knees). Individuals were classified into two groups: Thin bearing (Group 1): 3mm or 4mm bearing, and thick bearing (Group 2): ≥ 5mm. They assessed pre-and postoperative demographics, ROM, Knee Society scores, complications, and reoperations. The outcomes illustrated that in medial UKA, thicker bearings elevated the risk of tibial aseptic loosening, but not all-cause failures or clinical outcomes.