NOLTREX ™ is a synthetic material for endoprosthetics and correction of visco-elastic properties of joint synovial fluid. High viscosity, high molecular weight gelatinous biocompatible cross-linked polymer, which consists of cross-linked polyacrylamide (4.0 ± 1.5)%, silver ions (0.0001-0,0005%) and water; in a single-use syringe, color from transparent to light yellow, sterile, does not contain substances of animal origin, does not contain hyaluronic acid. It is an effective viscoprotez of synovial fluid, it is able to replenish the volume and restore the viscosity of synovial fluid lost as a result of arthrosis, which helps to reduce articular cartilage degeneration, reduce pain and increase the mobility of the joints. Has a very long period of action and an effective mechanism for blocking pain and mechanical destruction of cartilage in arthrosis, the clinical effect persists from 6 months to 2.5 years.