Shoulder prosthesis - has condyle and acetabulum made of specified material

摘要

A shoulder prosthesis replaces the condyle (12) of the upper arm bone (10) and the acetabulum of the shoulder blade by a cup (40). The condyle (12) is made of Ti or of a Ti alloy and the element (40) is made of plastic material, pref. RCH100 CHIRULEN (RTM). The part-spherical contact surface (18) of the condyle is matched to the contact face (42) of the acetabulum. The bolt element (16) has a blind hole (26) with a female thread (28) for the bolt (30) with head (32). The opening angle of the surface (42) from the centre of curvature (20) is max. 180 deg. Both elements (12, 14), the bolt (30, 32), the sleeve (34) and the studs (46) are coated with a ceramic bone substitute, pref. hydroxyl apatite. ADVANTAGE - This shoulder prosthesis resembles the Oxford knee prosthesis in its function; it corresponds to the movements of the natural shoulder and simplifies the implantation.