| 摘要 |
PURPOSE: An isoelastic bone-implant system of the invention minimizes, if not eliminates, the stress shielding effect created by a metal implant, thus, leading to a longer implant lifetime in the body. CONSTITUTION: An orthopedic implant comprising a thermoplastic polymer or a composite comprising, in one embodiment, polyetheretherketone reinforced with 10 % by volume of glass fibers, with an elastic modulus approximating the elastic modulus of bone. A porous coating is formed on the implant surface by creating a roughness thereon, by coating the surface with hydroxyapatite or by embedding a biocompatible material (18) such as titanium in the surface. A two piece embodiment of the implant is joined and locked together, after the opposite ends of each piece (10, 12) are inserted in the medullary canal, using an interlocking mechanism comprising a fluted protrusion (16) on one piece and a corresponding fluted cavity (14) in the other piece with the fluted portions being complementarily
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