title: Reply.
authors.affiliation: Tufts Medical Center, Boston, MA.
authors.forename: Timothy
authors.initials: T
authors.lastname: McAlindon
mesh_terms: D001842:Bone and Bones / Q000503:physiopathology*; D002358:Cartilage, Articular / Q000503:physiopathology*; D006801:Humans; D051457:Hyaline Cartilage / Q000503:physiopathology*; D007719:Knee Joint / Q000503:physiopathology*; D020370:Osteoarthritis, Knee / Q000503:physiopathology*