Abstract: A continuously length adjustable crutch comprising two telescoping tube parts, a handle attached to one of the tube parts, and a locking mechanism for securing said two tube parts in relative position to each other, said crutch further comprising (a) a piston/cylinder unit containing a pressure fluid and having a piston rod attached to a first of said tube parts, a cylinder part attached to the second tube part, and a piston connected to the piston rod and slideable in the cylinder while sealing against the cylinder wall, said piston dividing the cylinder space containing the pressure fluid into two chambers communicating with each other by means of a normally closed connection conduit, the piston rod being locked relative to the cylinder when the connection conduit is closed, the pressure fluid tending to expell the piston rod from the cylinder when said connection conduit is open, and (b) actuator means for opening and closing said connection conduit.