Comment on the article by Singh et al: The 2019 GBD Study provided very limited primary data to estimate the burden of osteoarthritis in India over 30 years

We read with great interest the article by Singh and colleagues (1) which reported incidence and prevalence estimates for hip, knee, hand, and other osteoarthritis (OA) in India and its 31 geographical units from 1990–2019. The estimates were sourced from the 2019 Global Burden of Disease (GBD) study. (2) We would like to alert the readers to the very incomplete primary data from India that underpin the 2019 GBD estimates for OA.