EFFECTS OF POSITION ON OSTEOARTHRITIS PROGRESSION IN EXTENDED KNEE RADIOGRAPHSBUCKWALTER, KENNETH ANational Institutes of Health (NIH), National Institute of Arthritis and Muscoloskeletal and Skin Diseases (NIAMS) (ID: 5P60AR020582-23-0024), $143,528USD, 04/01/2000 -- 03/31/2003