The use of a tripolar articulation in revision total hip arthroplasty: a minimum of 24 months' follow-up.

A retrospective cohort study of 31 hips revised with a tripolar articular construct was performed. Patient demographics and preoperative and postoperative information were recorded. Indications for a tripolar construct were recurrent dislocation and the inability to attain intraoperative stability during hip revision.

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.