An orthosis for stabilizing a joint has a joint rail having a first and a second rail portion which can be pivoted relative to each other about a joint axle. The orthosis has a pressure member which can be adjusted by a relative pivoting of the two rail portions about the joint axle in the direction towards and counter to the joint to be stabilized. One of the two rail portions has a cam disc, and the other of the two rail portions has a rotor which is guided on the cam disc, wherein the cam disc or the rotor is axially fixed in position on the correction pad.
