Knee osteoarthritis prevalence has doubled since the mid-20th century, with post-industrial samples showing higher prevalence than early industrial samples even after controlling for age, BMI, and other variables.

“this is a study that shows osteoarthritis has doubled in prevalence just in the mid 20th century they say here and i'll read this overall neo knee osteoarthritis prevalence was found to be 16 among the post-industrial sample but only six percent and eight percent among the early industrial and prehistoric samples respectively after controlling for age bmi and other variables knee osteoarthritis prevalence was 2.1 fold higher in the post-industrial sample than in the early industrial sample”