A system (10, 20, 30, 40, 50, 60, 70, 80, 90, 90', 100) for pre- and post-treatment of hip joint patients, comprising: a first support element (11, 21, 31, 41, 51, 61) which is movable in a first plane, on which at least one leg of a patient or the remaining body of the patient without the at least one leg can be supported and fixed; a second support element (13, 23, 33, 43, 53, 63) which is movable in a second plane, on which the remaining body of the patient without the at least one leg or at least one leg of the patient can be supported and fixed; wherein the first and second support members are movable relative to each other; and at least one first drive for moving at least part of the first support element relative to the second support element or at least part of the second support element relative to the first support element each from a first position to a second position and back again, both the first position and the second position lying in the first plane or both lying in the second plane; such that the at least one leg of the patient is movable relative to the remaining body of the patient without the at least one leg or the remaining body of the patient without the at least one leg is movable relative to his/her legs; at least one second drive for moving at least part of the first support element relative to the second support element or at least part of the second support element relative to the first support element from a third position to a fourth position and back again; wherein the third and fourth positions are both lying in the first plane or the second plane; wherein the first plane corresponds to the plane of the surface of the first support member and the second plane corresponds to the plane of the surface of the second support member; wherein the second drive moves the first support member relative to the second support member or the second support member relative to the first support member such that the movement between the third and fourth positions occurs substantially in the direction of the longitudinal axis of the at least one leg or in the direction of the longitudinal axis of the upper part of the patient's body so that an extension force is built up along the leg; wherein during the movement of the at least one leg of the patient relative to remaining body of the patient without the at least one leg, the extension force built up is maintained. a first support element (11, 21, 31, 41, 51, 61) which is movable in a first plane, on which at least one leg of a patient or the remaining body of the patient without the at least one leg can be supported and fixed; a second support element (13, 23, 33, 43, 53, 63) which is movable in a second plane, on which the remaining body of the patient without the at least one leg or at least one leg of the patient can be supported and fixed; wherein the first and second support members are movable relative to each other; and at least one first drive for moving at least part of the first support element relative to the second support element or at least part of the second support element relative to the first support element each from a first position to a second position and back again, both the first position and the second position lying in the first plane or both lying in the second plane; such that the at least one leg of the patient is movable relative to the remaining body of the patient without the at least one leg or the remaining body of the patient without the at least one leg is movable relative to his/her legs; at least one second drive for moving at least part of the first support element relative to the second support element or at least part of the second support element relative to the first support element from a third position to a fourth position and back again; wherein the third and fourth positions are both lying in the first plane or the second plane; wherein the first plane corresponds to the plane of the surface of the first support member and the second plane corresponds to the plane of the surface of the second support member; wherein the second drive moves the first support member relative to the second support member or the second support member relative to the first support member such that the movement between the third and fourth positions occurs substantially in the direction of the longitudinal axis of the at least one leg or in the direction of the longitudinal axis of the upper part of the patient's body so that an extension force is built up along the leg; wherein during the movement of the at least one leg of the patient relative to remaining body of the patient without the at least one leg, the extension force built up is maintained.