Compare the speed of action of three weekly intra-articular injections of a combination of hyaluronic acid and mannitol (HAnox-M) with that of hyaluronic acid alone (BioHA), in patients with knee osteoarthritis Addition of Mannitol to Hyaluronic Acid may Shorten Viscosupplementation Onset of Action in Patients with Knee Osteoarthritis: Post-Hoc Analysis of A Double-blind, Controlled Trial