Abstract: The solution is based on the fact, that on the surface of the acetabulum (3) there is a self-drilling thread, containing at least three independent teeth (41, 42 and 43) which advantageously have a concave shape of the cutting edge and a truncated pike, whereas the planes of their upper edges lie on a spherical surface. The femoral component (1) has on outer side of its lower part (11) an asymmetric tapering under the angle &ggr;=20° to 70° and on the upper part (13) a convexly widened outer side. Minimally on the lower part (11) and middle part (12) of the inner side of the femoral component (1) at least one longitudinal groove (5) is provided, and minimally on one side plane of the middle part (12) and/or of the upper part (13) there, is provided at least one transversal rib (6), forming with the axis of the wedge an angle &bgr;=70° to 110°.

Abstract: The device consists of at least two segments which are fixed on spinal vertebrae and which are mutually interconnected. Each segment (1) is fixed on at least one vertebra (7) by means of at least one fixing segment (3). Each segment (1) is connected by means of at least one spring (4) by the force coupling with at least one other segment (1') fixed on at least one other vertebra (7'). The connecting line of 8 the spring (4) ends contains with the vertical vertebral axis (7) an angle to 45.degree. in the frontal as well as in the sagittal plane in the ventral and/or dorsal direction. Required stability of the spine is ensured while preserving the necessary flexibility and adaptation to growth.