The Articular Surface Replacement (ASR) hip resurfacing from DePuy was introduced in July 2003, at around the same time as a number of other hip resurfacing devices. It was marketed as having the advantages of a reduced diametrical clearance (said to reduce wear) and a sub-hemispherical cup...

The Durom hip resurfacing is a metal-on-metal hip resurfacing introduced in 2003. The device has a Metasul® bearing, which is wrought-forged Cobalt Chrome – the Protasul-21 WF alloy. This bearing was developed by Sulzer (subsequently Centerpulse, itself acquired by Zimmer in 2003), and...

The Conserve Plus is a hip resurfacing device from Wright Medical which obtained FDA approval in 2009. The socket is manufactured from cast cobalt-chrome and it has a sintered porous coating for cementless fixation. The geometry of the socket includes a 170 degree coverage angle, and the edge of...

The Trabecular Metal Osteonecrosis Intervention Implant from Zimmer is intended for use in osteonecrosis of the femoral head, in Ficat and Arlet Stage 1 or 2 (ie precollapse) disease.  A study by Varitimidis et al (1) suggested an improvement in function after implantation, but no effect...

The Global Tissue Sparing (GTS) primary hip stem is a short uncemented hip stem intended to spare bone and possibly soft tissue. In an early series of 81 stems in 80 patients, there was one calcar fracture and no loosening at a mean of 16 months (6 to 24 months). Reference: Morales...