title: A new method for the measurement of anteversion of the acetabular cup after total hip arthroplasty.
abstract: OBJECTIVE
  Many methods of determining the anteversion of the acetabular cup have been described in the literature. The advantages and disadvantages of each of these methods are discussed in this paper. We present a new method of measuring the acetabular anteversion at the anteroposterior hip.
  
  
  METHODS
  The formula designed by the authors was anteversion angle (α) = arc sin |PK|/√ |AK| × |BK|. The formula was tested using the AutoCAD software, and an experimental study was conducted to evaluate the accuracy. Three groups were created, and 16 X-ray images were taken and coded. Ten orthopaedic surgeons measured the acetabular anteversion from these X-rays using our formula.
  
  
  RESULTS
  The results in Group 1 were closer to the actual value; in contrast, the results in Group 2 differed from the actual values. The results in Group 3 were as close to the actual anteversion values as were those in Group 1.
  
  
  CONCLUSIONS
  Developments in technology often bring an increase in complications. Despite newly developed surgical methods and technology, the position of the acetabular cup is still used to determine the results of a total hip arthroplasty. Our method is simple, cost-effective and achieves almost 100 % accuracy.
authors.affiliation: Bosphorus Spine Center, Çakmak Mh Tavukçuyolu cd Ağaoğlu MY City B2 D2932 Umraniye, Istanbul, Turkey, maydogan50@hotmail.com.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Aydogan
authors.forename: Halil
authors.initials: H
authors.lastname: Burç
authors.forename: Gursel
authors.initials: G
authors.lastname: Saka
mesh_terms: D000077:Acetabulum / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D060750:Bone Anteversion / Q000000981:diagnostic imaging* / Q000209:etiology; D017076:Computer-Aided Design; D006801:Humans; D055641:Mathematical Concepts; D011183:Postoperative Complications / Q000000981:diagnostic imaging* / Q000209:etiology; D011859:Radiography