Further, lack of registration of revision is unlikely to be associated with registration of primary procedures, resulting in relative risk estimates close to null, thus of no difference to the groups we compared.
Thus, lack of registration of revisions may cause underestimation of the overall revision rate in our study, but it would not have biased relative risk estimates substantially.
However, their May 2006 report on the issue, "Equality for All Families" launched by ICCL founder Kader Asmal, called for legislated partnership registration and revisions to the constitutional provisions on civil marriage and the family, to give improved protection to children.
Completeness of registration of revisions in the DHR is approximately 90%.
In addition, lower registration of revisions than of primary procedures is a general problem in arthroplasty registries.
The lack of registration of revisions in the DHR (approximately 10%) is most likely non-differential, i.e. independent of hip diagnosis for THA (Pedersen et al. 2004).
As with most other registers, the arthroplasty register in Norway gives information mainly based on the registration of revisions with removal or exchange of the whole or a part of a prosthesis (Engesaeter et al. 2006, Helse-Bergen 2008, Kärrholm et al. 2008, Hooper et al. 2009).
The aim of this study is to refine the deformable image registration by manual revision for clinical applications.
Registration completeness of revision is reported to be higher (97%) in the Norwegian knee arthroplasty registry and lower (80%) in the Swedish knee arthroplasty registry than in the DKR (88%).
Factors other than the implant itself, such as surgical technique, revision policy, incorrect registration, or unknown patient factors may bias the results.
