title: Bilaterally primary cementless total hip arthroplasty in patients with ankylosing spondylitis.
abstract: BACKGROUND
  The purpose of this study was to document the clinical and radiographic results of a consecutive series of patients with ankylosing spondylitis (AS) who had undergone bilaterally primary THA using non-cemented components.
  
  
  METHODS
  Twenty-six hips of 13 patients with bilateral ankylosis of the hip caused by AS were converted to THA from January 2000 to January 2008. The mean age of the patients was 33.7 years (range, 22-57 years). There were 11 males and 2 females. All the patients had bilateral bony ankylosis with 0° range of motion. The average Harris Hip Scores (HSS) was 22.1 (10-38).
  
  
  RESULTS
  At a mean follow-up of 128.4 months, the mean HSS at the latest follow-up examination was 91.7 points (range, 75-98 points). All the patients reported marked relief of painful symptoms. Three (11.5%) of the 26 hips were outside the Lewinnek acetabular cup inclination safe range, and 5 (19.2%) of the 26 hips were outside the Lewinnek acetabular cup anteversion safe range. The probability of survival of the prostheses was 100% at 5 years and 92.3% at 10 years, but it dropped sharply to 73.1% at 13 years.
  
  
  CONCLUSIONS
  Cementless THA is a worthwhile treatment for the osseous ankylosed hip joint caused by AS. Newfound mobility, maneuverability, and improved ability to sit comfortably were the outcomes that alleviated the patients' daunted morale. However, the technically demanding nature of the procedure should not be underestimated.
authors.affiliation: Department of Orthopaedics, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, P R China. wangwc2013@126.com.
authors.forename: Wanchun
authors.initials: W
authors.lastname: Wang
authors.forename: Guoliang
authors.initials: G
authors.lastname: Huang
authors.forename: Tianlong
authors.initials: T
authors.lastname: Huang
authors.forename: Ren
authors.initials: R
authors.lastname: Wu
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001843:Bone Cements; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013167:Spondylitis, Ankylosing / Q000000981:diagnostic imaging* / Q000601:surgery*; D055815:Young Adult
chemical_list: D001843:Bone Cements