title: Reply.
authors.affiliation: Tufts University.
authors.forename: Kieran F
authors.initials: KF
authors.lastname: Reid
authors.affiliation: Tufts University.
authors.forename: Roger A
authors.initials: RA
authors.lastname: Fielding
authors.affiliation: Tufts Medical Center and Tufts University, Boston, MA.
authors.forename: Lori Lyn
authors.initials: LL
authors.lastname: Price
authors.affiliation: Tufts Medical Center and Tufts University, Boston, MA.
authors.forename: William F
authors.initials: WF
authors.lastname: Harvey
authors.affiliation: Tufts Medical Center and Tufts University, Boston, MA.
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Driban
authors.affiliation: Tufts Medical Center and Tufts University, Boston, MA.
authors.forename: Chenchen
authors.initials: C
authors.lastname: Wang
mesh_terms: D005260:Female; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D020370:Osteoarthritis, Knee / Q000503:physiopathology*; D010146:Pain / Q000503:physiopathology*; D052097:Quadriceps Muscle / Q000503:physiopathology*; D011788:Quality of Life