Early clinical results with the hydroxyapatite-coated porous long-term stable fixation total hip system.

The design and early clinical results with uncemented porous-coated long-term stable fixation anatomic and midstem total hip systems (Implant Technology, Inc, Secaucus, NJ) are described. In an ongoing Food and Drug Administration-approved Investigational Device Exemption-Premarket Approval Program, a random selection method is used to determine patients receiving implants with a hydroxyapatite (HA) coating applied to the porous surface and those receiving uncoated implants. The early clinical results with the HA-coated systems show them to appear superior to the uncoated systems. A greater percentage of patients with HA-coated systems have clinical scores in the excellent to good range, which is primarily a reflection of less prostheses-related pain. Radiographically, all components appear well fixed, with evidence of bone ingrowth. The HA-coated systems have a decreased incidence of radiolucencies, particularly in proximal zones.