Implants cement-free

FIXATION BY INGROWTH (CEMENT-FREE IMPLANTS IN BONE)... 

The outcome of cement-free orthopaedic implants depends, as does the outcome of craniofacial osseointegrated implants, on the more or less simultaneous control of a number of different factors including biocompatibility, design and surface conditions of the implant, the state of the host bed, the surgical technique and the loading conditions after implant insertion. 

Herein is the explanation for the dubious results of many current designs of cement-free hips and knees the implant material used, the design and... 

The estimation of the depth of interaction revealed that not only the implantation of the Cu ions into the matrix lattice with forming isolated ions is possible, but the formation of small surface clusters (CuO)x with highly covalent Cu—O bonds. The distribution of catalytically active component between the free oxide, clusters, and ions implanted into the matrix lattice depends both on the conditions of formation and on the composition of the catalytic system as well as on the type of cement-containing agent. 

Anatomical ShoulderModular titanium stem and cobalt chromium humeral head prostheses with UHMWPE four-pegged glenoid components sterilized by gamma in an oxygen-free environment. Developed with Drs. Christian Gerber and Jon Warner, the first implantation was performed in 1995. It is intended for primary, hemiarthroplasty, total, and fracture use with cemented and press-fit fixation. 

Application of PMMA as fixative for bone was first demonstrated by Charnley [52]. The PMMA bone cement is composed of the liquid monomer MMA, a partially polymerized PMMA powder, an initiator (commonly used dibenzoyl peroxide), an activator (N, A-dimethyl-p-toluidine), a radiopacifier (visible to X-rays) such as barium sulfate or zirconium oxide, and a copolymer to influence the mixing and handling of the cement [53]. In some cases, an antibiotic (e.g., gentamicin) is included in the formulation to minimize infection during implantation. The polymerization is initiated by the interaction between the activator and the initiator, yielding a free radical... 

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