RT Journal Article SR Electronic T1 Systematic review is the highest level of evidence for knee osteoarthritis injection options, not expert society guidelines JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 622 OP 622 DO 10.1136/bjsports-2016-097312 VO 51 IS 7 A1 John W Orchard YR 2017 UL http://bjsm.bmj.com/content/51/7/622.abstract AB