QUANTITATIVE AND QUALITATIVE EVALUATION O F OSTEOGENIC PROPERTIES OF AN ORDERLY WIRED SURFACE EFFECT

Purpose The aim of this study was to evaluate the bony anchorage of a new implant (orderly wired surface effect with alloy Ti Al Va and orde red pores of 488 mu). Bony integration was analyzed on qualitative and quantitative aspects. Materials and methods The implants were inserte d into both femurs of six sheep in three localisations, in all 36 impl ants, during a period of 6 to 33 weeks. The implants were opposed on c ortical bone or impacted into trabecular cancelous bone after corticot omy. Evaluation of rehabitation was realized using conventional radiog raphy, MRI, isotopic study and particularly by computer assisted histo morphometry (BIOCOM program). This new technic evaluated the trabecula r bone volume (TBV) of the implant, the trabecular bone density, and t he mean trabecular width in real value with precision and objectivity. Results This study shows that there was good osteointegration of the implant, that this osteointegration differed with the localization of implantation. Quantitatively, the BIOCOM program showed that for metap hyseal implants in cancelous bone, the TBV of the implant was greater than that of the environment of the implant. Discussion It is question able to speak of osteoinduction in an osteogenic situation but it is c ertain that in many implantation conditions, the TBV is more important in the implant than that of the environment surrounding the implant. This shows the excellent osteointegration of the implant. Conclusion T his implant brings a new concept of rehabitation space with its partic ular geometry of structure. This quality is confirmed by clinical expe rience with uncemented knee prosthesis.