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There was an increase in revisions due to dislocation and infection.
An evaluation of reasons for revision did not indicate an increase in revisions due to the unique tibial insert articulation.
We found an increase in revisions due to deep infection that was most pronounced for uncemented prostheses.
In the study by Bystrom et al. on data from the NAR, the use of 28-mm heads in the later period, compared to 32-mm heads previously, was found to be the main cause of the increase in revisions due to dislocation.
The trend was opposite when considering revision due to dislocation, with an overall increase in revisions due to dislocation throughout the study period, with a greater increase in procedures taking place within the first postoperative year, but also after the first year (Table 5a, column 4).
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For these 2 major causes of revision, no increase in revision within the first postoperative year was seen.
According to several reports (Kurtz et al. 2007, Pabinger and Geissler 2014) an increase in revision hip arthroplasties is expected.
This increase in minor partial 1-stage exchange revision could then partially explain the reported increase in revision for infection in Norway (Dale et al. 2009, Walenkamp 2009).
In the cemented group of primary THAs, with revision due to deep infection as endpoint, we found the same pattern of gradual increase in revision risk over time (Table 2, Figures 1 and 2).
Considering the anticipated increase in revision hip procedures and the corresponding demands on rehabilitation inpatient beds, it is important that we gain a better understanding of the factors influencing rehabilitation LOS after revision hip replacements.
For every mm increase in 2-year proximal migration, there was a 10% increase in revision rate, which remained after correction for age, sex, diagnosis, hospital type, continent, and study quality.
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