Surgical interventions for OA include fragment removal, bone repositioning, bone fusion, and arthroplasty.
Arthroplasty
In essence, they remove all affected parts of the joint which may include the femoral head, the acetabulum and any debris. The joint is then ‘replaced’ by prosthetics which replicate your hip joint - the shaft, the head, the cartilage and the acetabulum
The shaft is replaced by stem implants, of which there are two types – cement and porous. For cement implants, they inject cement into your femoral canal and then insert the implant to allow the cement to set around and hold the implant in place. For porous, they prepare the canal to fit tightly around the implant, and the porous surface allows ingrowth from the bone into the implant to secure it in place.
The head, or the ball, is then mounted on top of the stem, which is then covered by polyethylene liner, then capped off by the acetabular shell. The parts are then put in place, and the wound is closed.
http://zimmer.com.au/z/ctl/op/global/action/1/id/528/template/PC/navid/915
http://zimmer.com.au/z/ctl/op/global/action/1/id/8140/template/PC/navid/862
http://www.bonesmart.org/hip_replacement.php?gclid=CPPKwuiZ1JUCFRIcawodTEpxhw
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