Effectiveness and Safety of Intra-articular SEMICAL GEL-B CROSS Therapy in Knee Osteoarthritis (SEM-ART1)

The goal of this clinical trial is to evaluate the effectiveness and safety of intra-articular injection of a cross-linked sodium hyaluronate; SEMICAL GEL-B CROSS, in knee osteoarthritis. Primary objectives: The aim of this study is to obtain short- and long-term clinical data on the performance and safety of intra-articular injection of SEMICAL GEL B-CROSS, produced and marketed by Semical Biosurgery incorporated company, in knee osteoarthritis patients. It is also aimed to monitoring known adverse events and complications, detecting previously unknown adverse events and complications, to identify and analyze emerging risks based on real-life data. Participants will receive intra-articular injection of either a cross-linked sodium hyaluronate (SEMICAL GEL-B CROSS); or placebo (isotonic saline solution) at baseline, and will be followed-up for one year to compare the effectiveness and safety of the given therapy.