Hospital data, demographic data, date of index operation, date of revision surgery, operated side, diagnosis (primary or reason for revision), type of prosthesis, and in cases of revision the type of procedure are reported.
His research and teaching had a profound influence on the development of hip replacement operations and of revision (re-do) hip surgery.
An operation of contraction (revision) on a logically closed belief set can be obtained by assigning to it a finite belief base and an operation of contraction (revision) on that base.
We provide two kinds of semantics for this idea, give a logical characterization of the new model, study its relation with other operations of belief revision and contraction, and discuss its intuitive strengths and weaknesses.
Thus, in the Cox regression model we adjusted for the potential confounding factors that we know from the registry database: revision TKA with and without resurfacing of the patella, age (< 60, 60 70, > 70 years), sex, type of fixation, year of revision operation, type of revision operation, whether or not the primary or the revision TKA was resurfaced, and prosthesis brands.
So far, no-one has been able to demonstrate that computer assisted surgery reduces the number of revision operations.
Of the 302 original patients, 87 died during the first year of follow-up and 7 had a revision operation of their HA. 4 revisions were performed because of infection, 2 because of aseptic loosening, and 1 due to persistent instability.
The type of revision operation depends on the failures at the various interfaces and a good outcome can be produced consistently if the interface problems are managed appropriately.
Overall, we found no statistically significant effect of period of revision operation on the survivorship of revision TKAs.
However, for the graphical examination it appeared that 2 variables (year of revision operation and type of revision TKA) violated this assumption.
