The Acetabular Component in Primary Total Hip Arthroplasty

The cemented all-polyethylene acetabular component has almost completely been replaced by the cementless porous-coated acetabular component. A variety of different designs, incorporating several types of porous coatings, have proven to be reliable and durable. The ability to reposition a cementless cup to optimize component orientation allows the joint replacement surgeon to minimize impingement and maximize component stability. This is essential to prevent dislocation and damage to bearing surface of the acetabular component. Insertion of a hemispherical cementless cup with 1 mm of under-reaming typically allows for secure interference fit, good apposition of the implant to the underlying bone, an insignificant risk of pelvic fracture, and a rare risk of ingrowth failure.