The hazard rate is the instantaneous rate of an event, for example revision, amongst those still at risk of experiencing revision.
Thus, if patients with a cementless prosthesis had not experienced revision within 1.5 years, there was no difference in the probability of revision compared to patients with cemented prostheses, holding other covariates constant.
This is probably because at any time, the probability of death was higher for patients with monoblock prostheses than for patients with bipolar prostheses, leaving fewer patients with monoblock prostheses left to experience revision.
For the primary analysis models, individuals not experiencing a revision, terminating membership or dying prior to experiencing a revision were treated as censored cases, with survival calculated as time from surgery to each of these alternative events.
In the meantime and since 1987 by RCP Consult GmbH (RCP) the programs have experienced many revisions, improvements and additional developments.
We conclude that the revision risk of knee prostheses in general can be analysed without consideration for subject dependency, at least in study populations with a relatively low proportion of subjects having experienced bilateral revisions.
In our experience, revision surgery takes about 30 (removal) to 60 (replacement) minutes longer than an initial implantation (which typically takes approximately 45 min), as careful dissection of fibrous scar tissue surrounding the neurovascular bundle under microscopic magnification is needed.
20 The 50-patient cohort experienced a revision rate of 8% after 3 years, 20 which was also comparable to revision rates for other MIS treatments (8%–15%).
They teach physicians around the country advanced bariatric laparoscopic techniques and are highly experienced at revision, or "re-do" procedures for previous weight-loss surgeries performed at other locations.
Train schedules on the Hudson and Harlem lines experienced only minor revisions, although the Harlem line will have more changes next spring, when construction resumes.
When interpreting the risk estimates for age groups the impact of life expectancy on revision risk should be taken into consideration since older patients will experience death before revision more often than younger patients.
