Founded in 1976, The International Hip Society is focused on the exchange of ideas among expert hip surgeons from around the world with the objective of improving the life of patients afflicted with hip diseases [2]. The 40th anniversary of the society was celebrated in September 2015 in conjunction with the closed meeting in Chicago, IL, USA. John J. Callaghan presided over the meeting, which included more than 75 presentations addressing the most innovative and controversial issues in hip surgery. Topics included hip preservation surgery, primary THA, health policy, complications of hip arthroplasty, bearing surface issues, and hip revision topics. Thirteen selected papers from the meeting are included in this issue of CORR®. A variety of additional concepts highlighting both progress and challenges in the field were the source of healthy discussion.