A brace (10) for a varus or valgus knee comprises a rigid frame (11) equipped in its central part with articulated joints (15), a fabric panel (12) integral with the frame (11) and when in place presenting an opening (23) at the front of the limb, means of constraint of the frame (11) to the femur and the tibia. The means of constraint consist of cross-straps (13) hinged to the frame (11) and the opening and closing of the brace (10) is at the front of the limb by fixing a first flap (20) to a second flap (21). IMAGE
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