The TVS brace is an orthosis for moderate valgus or varus instability of the knee. It is designed to hold a medially or laterally unstable knee from moving into a painful position of deformity while the knee is in extension and weight-bearing. The brace provides support and is effective when the wearer is walking or standing, the leather sling helps pull the knee towards the telescopic tube and prevent the knee from sagging into the last few, painful degrees of deformity. The brace has been designed with patient compliance in mind and is ultra lightweight (200grams/8oz), it can be put on or removed by the wearer in seconds and is universal.