title: Invited commentary.
authors: Institute for Clinical Outcomes Research and International Severity Information Systems Inc, 699 East South Temple, Suite 300, Salt Lake City, UT 84102-1282, USA. shorn@isisicor.com
authors: Susan D
authors: SD
authors: Horn
mesh_terms: D057186:Comparative Effectiveness Research; D006801:Humans; D007348:Insurance, Health; D007557:Israel; D007592:Joint Diseases / Q000503:physiopathology* / Q000534:rehabilitation*; D007719:Knee Joint / Q000503:physiopathology*; D018579:Patient Selection; D026741:Physical Therapy Modalities; D014481:United States