However, in these studies there were differences in revision techniques, patient profiles, prosthesis design, definition of "failure", and length of follow-up, which make direct comparison difficult.
There may be differences in risk pattern between SSI and revision due to infection after arthroplasty.
Deviations within these limits can therefore be assumed to be plausible and to represent differences in revision rates that may be caused cumulatively, e.g. due to personal skills, in-house standards and quality assurance, or patient selection.
There were differences in the risk of early revision between stem and cup types at implementation.
In addition, our analysis indicates that there are differences in the risk of early revision between stem and cup models not previously used in a hospital.
However, there were differences in the type-specific early revision risk between the stages of introduction, reflecting that some types are easier to implement than others.
Gray's test was used to examine whether there were differences in the overall cumulative incidence of revision by gender, categorised age (<55, 55 64, 65 74, 75 84 >85 years) and categorised BMI (<18.5, 18.5 24.9, 25 29.9, 30 39.9 and >40 kg/m).
In Cox regression analysis, there were no statistically significant differences in revision risk between the groups otherwise, but the revision risk for cementless group 2 operated 1987–1996 was higher than that for the cemented THRs operated during the same period (RR = 1.6; CI: 1.1-2.3 1.1-2.3.02) (Table 3, Figure 1).
There were no statistically significant differences in revision rate.
There were no statistically significant differences in revision rate or in adjusted risk of revision between any of the groups.
