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Objective. Intra-articular injections of hyaluronic acid (HA) have been reported to alleviate pain, reduce disability, and improve joint function in glenohumeral osteoarthritis (GH-OA). This retrospective study aimed to evaluate the effectiveness of a HA-based formulation (Hyalubrix®) in reducing the pain of patients with GH-OA and improving both patient's shoulder functions and quality of life (QoL). Methods. Data collected during the standard clinical practice of the center was retrospectively analyzed. The Simple Shoulder Test (SST) questionnaire reported data on the patient's ability to perform daily activities; the Euro-Quality of Life Health Assessment (EQ-5D) collected evidence on QoL; and changes in pain were evaluated through the Visual Analog Scale (VAS). SST and EQ-5D scores were analyzed comparing baseline values with those at the last follow-up, while VAS was investigated for all the available visits. Continuous values were summarized as mean ± standard deviation, median, and 25-75th percentiles. Shapiro-Wilk test assessed normality, with significance set at p