Kienböck's Disease - Incidence and operations in Finland: a nationwide register study.

This study assessed the nationwide incidence of Kienböck's Disease, and operations performed for Kienböck's Disease from the Care Register for Health Care in Finland 1996-2022. The mean annual total standardized incidence rate per million person-years was 9.60 (95% CI: 9.10-10.11) and for men and women, 10.38 (95% CI: 9.63-11.13) and 8.78 (95% CI: 8.10-9.45), respectively. The incidence rate was highest for 50-59-year-olds, at 15.49. Compared with women, the incidence rate for men was higher across all age groups up to 60-69 years. Altogether, 44% of the patients were operated on, and 19% of them had multiple operations. Partial arthrodesis was the most performed procedure and salvage procedures covered 62% of all operations. Our findings provide comprehensive new evidence about Kienböck's Disease distribution across Finland's population and offer insights into the burden caused by operations.Level of evidence: III.