Trial bearing insert

摘要

A retentive and removable trial bearing insert for use with a total hip replacement joint which includes a dual mobility or bipolar prosthetic cup which has a part-spherical bearing insert with a part-spherical inner bearing surface which engages a part-spherical bearing head on a femoral stem, comprises a part-spherical trial inner bearing element (1) dimensioned to replace the part-spherical bearing insert and which includes releasable retaining means (2) which engage the bearing head of the femoral stem or a trial bearing head thereof to hold the trial bearing element in place thereon.