Volume 391, Issue 10118, Pages 329-338 (January 2018) Arthroscopic subacromial decompression for subacromial shoulder pain (CSAW): a multicentre, pragmatic, parallel group, placebo-controlled, three-group, randomised surgical trial  Prof David J Beard, DPhil, Prof Jonathan L Rees, FRCS, Jonathan A Cook, PhD, Ines Rombach, MSc, Cushla Cooper, MSc, Naomi Merritt, BSc, Beverly A Shirkey, PhD, Prof Jenny L Donovan, PhD, Stephen Gwilym, FRCS, Prof Julian Savulescu, PhD, Jane Moser, MSc, Prof Alastair Gray, DPhil, Marcus Jepson, PhD, Prof Irene Tracey, DPhil, Prof Andrew Judge, PhD, Karolina Wartolowska, DPhil, Prof Andrew J Carr, FRCS Philip Ahrens, Cheryl Baldwick, Mark Brinsden, Harry Brownlow, David Burton, Muhammad Sohail Butt, Andrew Carr, Charalambos P Charalambous, Veronica Conboy, Lucy Dennell, Oliver Donaldson, Steven Drew, Amitabh Dwyer, David Gidden, Peter Hallam, Socrates Kalogrianitis, Cormac Kelly, Rohit Kulkarni, Tim Matthews, Julie McBirnie, Vipul Patel, Chris Peach, Chris Roberts, David Robinson, Philip Rosell, Dan Rossouw, Colin Senior, Bijayendra Singh, Soren Sjolin, Geoffrey Taylor, Balachandran Venkateswaran, David Woods Prof David J Beard, DPhil, Prof Jonathan L Rees, FRCS, Jonathan A Cook, PhD, Ines Rombach, MSc, Cushla Cooper, MSc, Naomi Merritt, BSc, Beverly A Shirkey, PhD, Prof Jenny L Donovan, PhD, Stephen Gwilym, FRCS, Prof Julian Savulescu, PhD, Jane Moser, MSc, Prof Alastair Gray, DPhil, Marcus Jepson, PhD, Prof Irene Tracey, DPhil, Prof Andrew Judge, PhD, Karolina Wartolowska, DPhil, Prof Andrew J Carr, FRCS Philip Ahrens, Cheryl Baldwick, Mark Brinsden, Harry Brownlow, David Burton, Muhammad Sohail Butt, Andrew Carr, Charalambos P Charalambous, Veronica Conboy, Lucy Dennell, Oliver Donaldson, Steven Drew, Amitabh Dwyer, David Gidden, Peter Hallam, Socrates Kalogrianitis, Cormac Kelly, Rohit Kulkarni, Tim Matthews, Julie McBirnie, Vipul Patel, Chris Peach, Chris Roberts, David Robinson, Philip Rosell, Dan Rossouw, Colin Senior, Bijayendra Singh, Soren Sjolin, Geoffrey Taylor, Balachandran Venkateswaran, David Woods  The Lancet  Volume 391, Issue 10118, Pages 329-338 (January 2018) DOI: 10.1016/S0140-6736(17)32457-1 Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license Terms and Conditions

Figure 1 Trial profile OSS=Oxford Shoulder Score. ASAD=arthroscopic subacromial decompression. AO=arthroscopy only. RCS=rotator cuff surgery. *Based on data received from 23 sites and data imputed for nine sites. †Median time to any type of surgery was 58, 56, and 217 days in the decompression, arthroscopy only, and no treatment groups, respectively. ‡One rotator cuff surgery did not involve decompression. The Lancet 2018 391, 329-338DOI: (10.1016/S0140-6736(17)32457-1) Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license Terms and Conditions

Figure 2 Oxford Shoulder Score in the intention-to-treat analyses Data are mean (95% CI) shown at follow-up timepoints. OSS= Oxford Shoulder Score. The Lancet 2018 391, 329-338DOI: (10.1016/S0140-6736(17)32457-1) Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license Terms and Conditions