As previously reported, AAHKS convened the AAHKS Quality and Patient Safety Summit on total joint arthroplasty at the end of August. The Summit attendees reached consensus regarding patient-reported outcomes and risk variables suitable for total hip and knee arthroplasty performance measures. A joint comment letter was developed and signed by AAHKS, the American Association of Orthopaedic Surgeons, The Hip Society, The Knee Society, and the American Joint Replacement Registry. AAHKS submitted the joint letter to CMS as an attachment to the AAHKS comment letter on the payment model. Read the collaborative summit comment letter and the PRO Summit Report 2015.