| 摘要 |
A total prosthetic hip constructed in accordance with the present invention is made up of a femoral implant (1A) and an acetabular implant (1B). The femoral implant includes a trochanteric body piece (2) which has a porous surface (22) over the portion of its exterior which is intended to be directly affixed to the natural bone. To achieve the desired bony ingrowth, pores of the porous surface are preferably sized in a range between about 250-450 .mu.. The exact dimensioning of the pores is known to those skilled in the art and is not particularly critical. Also included is an anchor (4) which is comprised of a permanent core (8) and a resorbable sleeve (6). Core (8) is preferably made of a metal alloy such as titanium-6-aluminum-4-vanadium. Outer resorbable sleeve (6) is formed of a biodegradable material, for example, high molecular weight poly-L- lactic acid (PLLA) polymers. Other such materials include calcium hydroxyapatite, tricalcium phosphate. |
