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[Qualitative and quantitative study of bone colonisation in a wired surface effect. An experimental study].

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 ordered pores of 488 mu). Bony integration was analyzed on qualitative and quantitative aspects.


MATERIALS AND METHODS
The implants were inserted into both femurs of six sheep in three localisations, in all 36 implants, during a period of 6 to 33 weeks. The implants were opposed on cortical bone or impacted into trabecular cancelous bone after corticotomy. Evaluation of rehabitation was realized using conventional radiography, MRI, isotopic study and particularly by computer assisted histomorphometry (BIOCOM program). This new technic evaluated the trabecular bone volume (TBV) of the implant, the trabecular bone density, and the 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 metaphyseal implants in cancelous bone, the TBV of the implant was greater than that of the environment of the implant.


DISCUSSION
It is questionable to speak of osteoinduction in an osteogenic situation but it is certain 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
This implant brings a new concept of rehabitation space with its particular geometry of structure. This quality is confirmed by clinical experience with uncemented knee prosthesis.