Methods for maintaining proper mechanics THA

A method of assembling a mobile bearing acetabular prosthetic component of a prosthetic hip joint, the method comprising:

• implanting an acetabular prosthetic cup including a rim surface, a concave curved inner surface extending inwardly from the rim surface to define an aperture in the acetabular prosthetic cup, and a first groove defined in the concave curved inner surface, the first groove extending along a first axis from a first opening defined in the rim surface to a second opening defined in the rim surface;
• mounting a first acetabular prosthetic cup insert to the acetabular prosthetic cup, the first acetabular cup insert including a convex curved outer surface, a concave curved inner surface positioned opposite the convex curved outer surface, a second groove defined in the concave curved inner surface of the first acetabular prosthetic cup insert that extends along a second axis, and a first elongated tab extending outwardly from the convex curved outer surface of first acetabular prosthetic cup insert, wherein mounting the first acetabular prosthetic cup insert to the acetabular prosthetic cup includes inserting the first elongated tab into the first opening in the first groove defined in the acetabular prosthetic cup to advance the first acetabular prosthetic cup insert into the aperture defined in the acetabular prosthetic cup and repositioning the first acetabular prosthetic cup insert with respect to the acetabular prosthetic cup such that the first acetabular prosthetic cup insert extends outwardly from the second opening beyond the rim surface of the acetabular prosthetic cup;
• and
• mounting a second acetabular prosthetic cup insert to the first acetabular prosthetic cup insert, the second acetabular prosthetic cup insert including a second elongated tab and a cavity sized to receive a prosthetic femoral ball, wherein mounting the second acetabular prosthetic cup insert to the first prosthetic acetabular prosthetic cup includes inserting the second elongated tab into the second groove defined in the first acetabular prosthetic cup insert and repositioning the second acetabular prosthetic cup insert with respect to the first acetabular prosthetic cup insert without disengaging the second acetabular prosthetic cup insert from the first acetabular prosthetic cup insert,
• wherein the first axis extends orthogonal to the second axis when the mobile bearing acetabular prosthetic component is assembled such that the first acetabular prosthetic cup insert is configured to tilt along the second axis and the second acetabular prosthetic cup insert is configured to tilt along the first axis orthogonal to the second axis.