From the Comparative Orthopaedic Research Laboratory
Department of Medical Sciences, School of Veterinary Medicine (Y.L., R.B.E, M.D.M) and the Department of Orthopaedics and Rehabilitation, School of Medicine (J.P.H.), University of Wisconsin-Madison, Madison, Wisconsin; and the Department of Orthopaedic Surgery, Rush Presbyterian Saint Luke's Medical Center, Rush University (S.N., B.J.C.), Chicago, Illinois, U.S.A.