Fig. (1) Clinical outcome after five years as assessed by the Knee injury and Osteoarthritis Outcome Score (KOOS). The KOOS profiles prior to and 1 year, 2 years and 5 years after implantation of the PGA-HA implant are presented (n=52). The columns show the mean and error bars define standard deviation (SD). spt, symptoms; ADL, activities of daily living; sport&recr, sports and recreation; QoL, quality of life. Pre-operative KOOS raw data, the 1-year follow-up and the 2-year follow-up data were taken from previous reports [24, 25].