Evaluation of sleeved implant fixation using a rat model

There was no significant difference between the cemented fixation and the sleeved fixation in areas of both BV/TV (bone volume/total volume) (p = 0.838) and the apparent interface strength (p = 0.530). However, the decrease in the BV/TV over time was significant in the cemented fixation (p = 0.021) while not in the sleeved fixation (p = 0.603). The sleeved fixation showed a gain in strength with time while the cemented fixation showed a reverse tendency but the difference was not significant (p = 0.125). The results showed the feasibility of the sleeved fixation even though the advantage of sleeved fixation was not clearly confirmed because of the small sample size and high variance as well as the suboptimal surface finish of the sleeve.