Acetabular cup prosthesis

摘要

Provided are acetabular cup implant assemblies that can be used in hip replacement surgery. Example assemblies comprise a shell and a liner. The liner can be positioned within a shell. Optionally, the liner can be rotated relative to the shell until the liner is seated in the shell in a position where the liner and shell can be secured to one another. Waveform-shaped features of the shell and liner can guide the relative rotation of the liner and shell. Also provided are methods of seating a liner in shell of an acetabular cup implant assembly.

主权项

1. An acetabular cup implant, comprising:
a shell having an outer shell surface adapted for seating in a subject's pelvic bone, an inner shell surface, a shell opening, and a rim positioned peripheral to the shell opening and having a waveform shape, the waveform shape having at least one wave peak and at least one wave valley; a liner adapted for insertion into the shell, the liner having an outer liner surface, an inner liner surface, a liner opening, and a rim positioned peripheral to the liner opening and having a waveform shape, the waveform shape having at least one wave peak and at least one wave valley, wherein at least a portion of the liner rim rests on at least a portion of the shell rim upon insertion of the liner into the shell; and a locking mechanism that is engageable upon insertion of the liner into shell in a position where one or more liner peaks rests within one or more shell valleys, wherein engagement of the locking mechanism secures the liner in the shell, and further wherein the locking mechanism protrudes vertically from the horizontal plane of the shell rim.