Abstract: A change-speed gearbox for orthopedic devices has a planetary gearbox with at least one planet stage having a central sun gear, a plurality of planet gears rotatably mounted on a planet carrier which come into engagement with the sun gear, and has a ring gear which meshes with the planet gears. The sun gear can be coupled to a drive. The planet carrier is coupled to an output element. The ring gear is pivotably mounted in a ring gear carrier and is coupled to the ring gear carrier via a switchable freewheel.

Abstract: The invention relates to an orthopedic joint device having an upper part (10), a lower part (20) mounted thereon so as to be pivotable about a pivot axis (15), and a blocking device (30) which blocks a pivoting movement of the upper part relative to the lower part, wherein the blocking device never blocks in one direction of pivoting and, in the opposite direction of pivoting, can be switched from a release position to a blocking position, wherein the blocking device is assigned an actuation element (40) that holds the blocking device in the release position or moves it to the release position.