Special Technical ArticlesTotal Hip Arthroplasty in Untreated Ankylosing Spondylitis: Tips and Tricks to Avoid ComplicationsReynolds, John MD; Harper, Katharine D. MD; Gokcen, Eric C. MDAuthor Information Department of Orthopedic Surgery & Sports Medicine, Temple University, Philadelphia, PA The authors declare that they have nothing to disclose. For reprint requests, or additional information and guidance on the techniques described in the article, please contact John Reynolds, MD, at John.email@example.com or by mail at Department of Orthopaedic Surgery and Sports Medicine, Temple University Hospital, 3401 North Broad Street, 6th floor Outpatient Building, Room B-602, Philadelphia, PA 19140. You may inquire whether the author(s) will agree to phone conferences and/or visits regarding these techniques. Techniques in Orthopaedics: March 2020 - Volume 35 - Issue 1 - p 67-72 doi: 10.1097/BTO.0000000000000323 Buy Metrics Abstract Ankylosing spondylitis (AS) is a seronegative inflammatory disease that progressively affects the spine and sacroiliac joints and is more common in men with the B 27 human leucocyte antigen. This leads to inflammation, synovitis and, eventually, secondary arthritis in the hips of those affected. Hips of those affected are often completely ankylosed at time of presentation to the orthopedic surgeon. Total hip arthroplasty offers a stable mobile hip for patients who are functionally disabled due to their debilitating disease. As disease progresses, the native hip anatomy, which is familiar to orthopedic surgeon in routine total hip arthroplasties for osteoarthritis, can be distorted by complete ankyloses. These surgeons must be aware of the unique technical challenges and considerations with regard to, anesthesia, OR setup, patient positioning, implant choice, and potential complications. The tips and tricks presented in this case provided the patient with a successful outcome due to careful planning and utilization of the described technical pearls. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.