This study determined the temporal trends and factors associated with
the rates of performance of tibial osteotomies from 1985 to 1990 in On
tario, Canada and the United States, The Health Care Financing Adminis
tration, Ontario Health Insurance Plan, and National Hospital Discharg
e Survey databases were used to determine the number of osteotomies fr
om 1985 to 1990, Osteotomy rates decreased in both countries approxima
tely by 11% to 14% per year in patients 65 years and older and by 3% t
o 4% per year in patients younger than 65 years, Men received twice as
many osteotomies as women in both countries, In the United States, th
e average rate of tibial osteotomies was 2 to 3 times lower than in On
tario.