The authors analyzed the nationwide, population-based, diagnosis-related groups data from German for the years 2005 and 2006. Procedure codes and diagnosis were analyzed for each hospitalization. Overall, 16,488 primary shoulder arthroplasties and 1302 revisions were performed during the study period.
The age-standardized hemiarthroplasty rates were 3.6 per 100,000 person-years for men and 9.3 per 100,000 person-years for women.
The age-standardized total shoulder arthroplasty rates were 1.7 per 100,000 person years for men and 3.7 per 100,000 person-years for women.
The 'revision burden' (Number of revisions arthroplasties or prosthesis extractions divided by the number of all operations (primary and revision)) over the study period was 4.7% for HA and 15.0% for TSA.
Multivariable-adjusted analysis showed increasing age was associated with a lower relative burden of revision, and an increased Charlson comorbidity index and male gender were associated with a higher relative burden of revision. The adjusted relative burden of revision was considerably higher for TSA than for HA (adjusted relative burden of revision, 2.89; 95% confidence interval, 2.60-3.22).
Comment: 'revision burden' is a somewhat strange term. Actually it is the fraction of all arthroplasties done during the study period that were revisions. This is not to be confused with the revision rate.
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