The prevalence of corporate funding in adult lower extremity research and its correlation with reported results.

The author reviewed 603 consecutive articles and scientific presentations pertaining to adult lower extremity orthopedic research from 2 major American orthopedic journals and 2 major American orthopedic meetings. The prevalence of commercial funding in these studies was 50%. Clinical studies of total hip arthroplasty implants by American investigators were commercially sponsored in 75% of studies. Commercially funded hip research reported positive outcomes in 93% of studies, whereas independently funded researchers reported good results in only 37%. Funded clinical studies of total knee arthroplasty implants yielded good results in 75%; this is in contrast to the findings of independently funded investigators, who reported positive conclusions in only 20% of studies. Investigators receiving royalties reported no negative outcomes related to the respective devices. The source of research funding was strongly correlated with reported outcomes.