Clinical total hip replacement with hydroxyapatite from 1984 to 1991.

Hydroxyapatite (HA) has been used for revision and primary total hip replacement surgery. HA has been used on both textured and porous coated implants for both primary and revision surgery. The results with textured implants have been compared with those of textured press-fit implants; with both revision and primary surgery the HA-coated prostheses were superior both clinically and roentgenographically. The results with porous coated implants have shown better bone remodeling and less radiolucent lines around the implants. The author's conclusions are that HA is effective in providing earlier stability of the implant and demonstrates better remodeling of the bone around the implant than do implants without HA. The author recommends the use of HA on porous coated implants so that if resorption of the HA occurs, the fixation of the porous coating will be present to provide durability.