Park SJ, et al. - This study was sought to correlate the functional outcomes of medial unicompartmental knee arthroplasty (UKA) between patients with lateral meniscal abnormalities (LM [+] group) on the preoperative MRI and those without lateral meniscal pathology (LM [-] group), and to assess the impact of a lateral meniscus lesion on functional outcomes after minimal 5-year follow-ups of medial UKA. Researchers compared outcomes of 66 knees (LM (+) group) to the outcomes of 59 knees (LM (-) group) with a mean follow-up period of 75 months (range 60-93 months). They analyzed clinical outcomes including the KS object/function score, KOOS score, lateral side pain, and squatting ability at the last follow-up. At the final follow-up visit, the radiological parameters (mechanical axis and component position) were compared. For medial unicompartmental knee osteoarthritis, the outcomes of UKA were excellent regardless of preoperative lateral meniscal pathology in the MRI, whether the individuals had no symptoms related to the lateral meniscus lesion.