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Exact(7)
This trend has changed in the most recent studies, which showed improved survival rates with fewer revisions per 100 observed years (1 revision per 100 observed years in recent studies vs 3.33 in the oldest series) [2, 8], with one series reporting no evidence of loosening and equivalent patient recorded outcomes to patients with an intact ACL [2].
We calculated the revision per 100 observed component years for each study, stem type, and stem category.
Thus, strict adherence to the benchmark of less than 1 revision per 100 observed component years when evaluating innovative hip implants is debatable.
The incidence rate of revision per 100 years of observation was highest with the monoblock all-polyethylene component (0.74) and lowest with the molded non-modular component (0.58).
The incidence rate of revision per 100 years of observation for all-cause revision of the monoblock all-polyethylene components was 0.30, and for the metal-backed modular components it was 0.65.
A value of 1 revision per 100 observed component years corresponds to a revision rate of 5% at 5 years or a 10% revision rate at 10 years in conventional follow-up studies.
Similar(53)
CPT-4: Current Procedural Terminology, 4th Edition; DVD: Digital video disc; ICD-9: International Statistical Classification of Diseases and Related Health Problems (9th revision); PMPM: Per member per month.
The potential biases in the chosen articles (country of origin, inventor involved in study, methodological quality) were systematically analyzed and the revisions per 100 observed component years (Revp100OCY) index was calculated.
Analysing failures and revisions per 100 observed years allows a comparison across studies with different follow up periods, but it is limited by the assumption that the distribution of complications is linear over time.
Data collected included student background questionnaires (N = 10), four student texts (originals plus revisions) per participant (N = 40), recordings and field notes from interviews with participants (N = 30), and recordings and notes from an end-of-semester interview with the classroom teacher.
Given a revision risk of 1% per year, this criterion ensures at least 25 'events' (revisions) per study.
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