Figure 1.

Knee injuries diagnosed in Australian hospitals from 1998-1999 to 2017-2018. Panel A) population pyramid of the total number of acute knee injuries in the 20-year analysis period diagnosed in males (green) and females (purple) aged 5 years and older; panel B) annual knee injury frequency for males and females from the analysis period and extrapolated until the year 2030-2031, panel C) annual knee injury incidence per 100,000 population for males and females for the analysis period and extrapolated until the year 2030-2031. For panels B and C: circles, annual knee injury number or incidence; solid line and shaded region, negative binomial regression model and 95% confidence interval, dashed and dotted lines, extrapolated negative binomial regression model and 95% confidence interval. Note the x-axis value in panels B and C indicate the index year i.e., 2000 represents from July 2000 to June 2001.