Wraps biaxial joints for instability. It is a knee orthosis of the Arrow brand, posterior closure and made of breathable elastic material. It can be adjusted to the stages of recovery thanks to the free polycentric joints and suitable serrated. It is made of aluminium with a special alloy that is harder and more resistant to shocks. It is designed so that its structure adapts to the morphology of the area where there is a discrepancy between the lower thigh and the upper knee area. The outer layer of the fabric facilitates rapid dispersion of sweat. It is indicated for the stabilization of the knee joint and the corresponding anatomical structures. For post-surgical and post-traumatic treatments. Suitable for people with a patella perimeter of 49-58 cm. Not suitable for people suffering from diabetes.