A knee orthosis comprising: a sleeve of elastic woven fabric, shaped to exert compressive forces on a lower limb on either side and on the knee, a pad (11, 11') comprising a viscoelastic layer, the pad being attached to an inner face of the sleeve so that the viscoelastic layer is in direct contact with the skin of the knee, the pad comprising an annular part shaped to surround the kneecap of the knee, and a distal tab extending from an outer edge of the annular part, in an axial direction of the sleeve, the viscoelastic layer having an adhesion with the skin such that, under the effect of the compressive forces exerted by the sleeve, when the sleeve is stretched longitudinally, the pad stretches and remains stretched by locally applying to the underlying limb portion support forces towards the center of the knee, and restoring forces in the axis of the limb, and proximal and distal anchors (19a, 19b) for maintaining proximal and distal parts of the sleeve at fixed positions on the lower limb, characterized in that the sleeve is formed from panels of fabric comprising: a front panel to which the pad (11, 11') is attached, a rear panel opposite the front panel, and having a modulus of elasticity in the axial direction of the sleeve, lower than that of the front panel, and two side panels (18a, 18b), each attached to a lateral edge of the front panel and to a lateral edge of the rear panel, and having a modulus of elasticity in the axial direction of the sleeve, greater than that of the front panel. a sleeve of elastic woven fabric, shaped to exert compressive forces on a lower limb on either side and on the knee, a pad (11, 11') comprising a viscoelastic layer, the pad being attached to an inner face of the sleeve so that the viscoelastic layer is in direct contact with the skin of the knee, the pad comprising an annular part shaped to surround the kneecap of the knee, and a distal tab extending from an outer edge of the annular part, in an axial direction of the sleeve, the viscoelastic layer having an adhesion with the skin such that, under the effect of the compressive forces exerted by the sleeve, when the sleeve is stretched longitudinally, the pad stretches and remains stretched by locally applying to the underlying limb portion support forces towards the center of the knee, and restoring forces in the axis of the limb, and proximal and distal anchors (19a, 19b) for maintaining proximal and distal parts of the sleeve at fixed positions on the lower limb, characterized in that the sleeve is formed from panels of fabric comprising: a front panel to which the pad (11, 11') is attached, a rear panel opposite the front panel, and having a modulus of elasticity in the axial direction of the sleeve, lower than that of the front panel, and two side panels (18a, 18b), each attached to a lateral edge of the front panel and to a lateral edge of the rear panel, and having a modulus of elasticity in the axial direction of the sleeve, greater than that of the front panel. a front panel to which the pad (11, 11') is attached, a rear panel opposite the front panel, and having a modulus of elasticity in the axial direction of the sleeve, lower than that of the front panel, and two side panels (18a, 18b), each attached to a lateral edge of the front panel and to a lateral edge of the rear panel, and having a modulus of elasticity in the axial direction of the sleeve, greater than that of the front panel.