A knee brace (10) consisting of an upper arch (12) positioned, when worn, above the knee and a lower arch (16) positioned, when worn, below the knee, connected to means of constraint for fixing to the limb, a first upright (13) equipped in its central part with a joint (15) consisting of a pair of respective rotating elements comprising toothed wheel portions prevented from reciprocally moving in a direction perpendicular to the axis of the brace, the first upright (13) presenting a first system designed to exert adjustable pressure on the knee joint and a second system designed to compensate the deformation of the first upright (13) in exerting this pressure, the first system consisting of a first micrometric angular hinge (20) positioned on the femoral part of the first upright (13) and a second micrometric angular hinge (21) positioned on the tibial part of the same upright (13), the brace having each of the respective rotating elements rigidly connected to a respective micrometric angular hinge element, and each micrometric angular hinge which is also rigidly connected to the second compensation system which is in turn connected to a respective femoral or tibial arch of the brace (10).