title: Invited commentary.
authors.affiliation: Department of Physiological Science, and Professor in the Department of Neurobiology, University of California, Los Angeles, CA 90095.
authors.forename: V Reggie
authors.initials: VR
authors.lastname: Edgerton
mesh_terms: D002648:Child; D006801:Humans; D015601:Injury Severity Score; D020127:Recovery of Function; D013119:Spinal Cord Injuries / Q000534:rehabilitation*; D016896:Treatment Outcome; D016138:Walking