Outcome of acetabular revision using an uncemented hydroxyapatite-coated component: two- to five-year results and review.

This is a retrospective review of 50 uncemented acetabular revisions with porous, hydroxyapatite-coated cups. The acetabulum alone was revised in 22 hips and both components were revised in 28 hips. The majority of hips (26) had type 2A (Paprosky) acetabular bone loss. All the revisions were carried out through a posterior approach. The mean duration of follow-up was 32 months (range, 24-52 months). Clinically, there was significant improvement in pain and moderate improvement in movement and mobility, and there is no radiological sign of failure of any cup so far. Re-revision was performed in 3 hips (6%) for recurrent dislocation. Our early results favor the use of this type of cup in acetabular revisions with moderate bone loss, but longer-term follow-up will be required. Key words: acetabulum, hydroxyapatite, revision, bone deficiency, complications.