Self-centering, anti-seizing acetabular liner

A self-centering, anti-seizing acetabular liner adapted for insertion into an acetabular shell for use in hip arthroplasty, the liner comprising:

• a concave bearing inner surface adapted to engage a femoral head;
• an outer bearing surface adapted to engage the acetabular shell;
• a peripheral rim extending between the inner bearing surface and the outer bearing surface, wherein the outer bearing surface includes a locking section extending from the rim, a composite-curved section extending from the locking section at a first transition point, and a curved dome section extending from the composite-curved section, wherein at the first transition point, the composite-curved section is tangential to the locking section;
• wherein the composite-curved section includes a curved radial portion and a straight-line tangential portion, wherein the radial portion extends from the locking section at the first transition point, and wherein the tangential portion extends from the radial portion at a second transition point;
• wherein the dome section extends from the composite-curved section at a third transition point and the composite-curved section is tangential to the dome section at the third transition point;
• wherein the locking section comprises a conically tapered circumferential wall;
• wherein there is continuity between the locking section and the radial portion, and continuity between the tangential portion and the dome section, so that no edge, corner, or sharp point exists on the entire outer surface of the acetabular liner;
• and
• wherein the structure of the outer bearing surface of the acetabular liner is configured to prevent the occurrence of a cross-locked taper junction when inserted into an acetabular shell.