RT Journal A1 Cheng, Edward Y. T1 Joint Arthroplasty: The Climate Has Made It Ripe for Quality Assessment, but How Do We Compare Apples to Apples?Commentary on an article by Gary J. Hooper, FRACS, et al.: “The Relationship Between the American Society of Anesthesiologists Physical Rating and Outcome Following Total Hip and Knee Arthroplasty. An Analysis of the New Zealand Joint Registry” JF The Journal of Bone & Joint Surgery JO The Journal of Bone & Joint Surgery YR 2012 FD June 20 VO 94 IS 12 SP e91 1 OP 2 DO 10.2106/JBJS.L.00351 UL http://dx.doi.org/10.2106/JBJS.L.00351 AB