Je. Dalton et Sd. Cook, INFLUENCE OF IMPLANT LOCATION ON THE MECHANICAL CHARACTERISTICS USINGTHE TRANSCORTICAL MODEL, Journal of biomedical materials research, 29(1), 1995, pp. 133-136
Mechanical evaluation of implants harvested following surgical implant
ation is often performed as part of the screening process for new mate
rials or surface textures. The question of randomization with respect
to implant placement often arises when attempting to design a study to
evaluate several implant types, while minimizing the number of animal
s required to perform the investigation. The purpose of this study was
to analyze the effects of implant placement within the canine femur o
n mechanical characteristics of the bone-implant interface when using
the transcortical model. Both smooth and porous-surfaced implants were
evaluated at several time periods to determine the effects of placeme
nt in the medial versus left cortex, proximal versus distal placement,
and left versus right femur. The smooth-surfaced implants demonstrate
d a significant effect due to proximal versus distal placement within
the femur only. There were no other significant comparisons. Porous-su
rfaced implants demonstrated no significant effects due to placement w
ithin the femur. The results demonstrate the necessity for careful stu
dy design when evaluating smooth surfaced implants; however, paired co
mparisons in either the medial versus lateral cortex or left versus ri
ght femur will provide unbiased comparisons between the implants. (C)
1995 John Wiley and Sons, Inc.