Splints 2R – double axis polycentric splints, with rack gear which reflects the anatomic knee movement. Such splints are used in all knee joint braces where apart from angle adjustment lateral joint stabilization is also important. The splints are manufactured with high quality of aluminium alloy with sanded, durable cover which is neutral to the influence of sweat and salt. Required flexion and extension angle in every 20° is set by using the special pins. The splints are equipped with special oval covers to prevent the pins from falling out as well as from changing of the angle by unauthorized people. Standard length of the splints is 390 mm, but the braces with longer splints are additionally equipped with lateral stabilization of the knee joint. The splint and its design are patented in European Union by Reh4Mat Company.