Growing prosthesis

Growing prosthesis comprising a joint replacement part (1), a prosthesis stem (2), a stem-anchoring element (3), and a drive (5) including a spindle element (4) for lengthening of the growing prosthesis, wherein the joint replacement part (1) has an end with a shape and geometry similar to a joint to be replaced, an opposite cylindrical end, and an inner central bore formed therein, wherein the prosthesis stem (2) is a substantially cylindrical structure having said stem-anchoring element (3) attached at one end thereof and an opposite open end having an inner central bore formed therein, wherein the cylindrical end of the joint replacement part (1) is telescopically fitted within the inner central bore of the prosthesis stem (2), wherein said spindle element (4) is arranged in the stem-anchoring element (3), the drive (5) of the spindle element (4) is integrated within the inner central bore of the joint replacement part (1), wherein a screw (9) with a threaded element (8) is introduced into a bore at one end of the stem-anchoring element (3) and serves as a mating piece for the spindle element (4), the threaded element (8) having a through-hole with an inner thread (10) therein, wherein the screw (9) has a cloverleaf-shaped recess or depression into which the threaded element (8) is inserted with a form fit, wherein the threaded element (8) is connected with a form fit to the stem-anchoring element (3), and wherein the threaded element (8) serves as a fixing means for the spindle element (4) against the stem-anchoring element (3), wherein the form fit connection ensures simple removal or insertion of the spindle, and wherein the prosthesis has a reduced prosthesis length and a reduced prosthesis diameter so as to permit easier use of such prostheses in children and adolescents or in persons of small stature.