Cementation of a polyethylene liner into a metal acetabular shell: a biomechanical study.

Cementation of a liner into a well-fixed acetabular shell is common in revision hip arthroplasty. We compare the biomechanical strengths of cemented liners with standard locked liners. Fifty polyethylene liners were inserted into acetabular shells using the standard locking mechanism or 1 of 2 cement types then loaded to failure by torsion or lever-out testing.

The relationship of proximal locking screws to the axillary nerve during antegrade humeral nail insertion of four commercially available implants.

Objective: The purpose of this study was to determine the proximity of proximal interlocking mechanisms in 4 current antegrade humeral nails to the axillary nerve and its branches.

Design: Cadaveric study.

Setting: Anatomy laboratory.