title: Bicentric bipolar hip prosthesis: A radiological study of movement at the interprosthetic joint.
abstract: BACKGROUND
  The bipolar hip prostheses after some time functions as a unipolar device. There is a need to change the design of bipolar hip prostheses to make it function as a bipolar device over a prolonged period of time. A bicentric bipolar hip prosthesis was used as an implant for various conditions of the hip. We evaluated the movement of this newly developed prosthesis at the interprosthetic joint radiologically at periodic intervals.
  
  
  METHODS
  Fifty two cases were operarted with the Bicentric bipolar prosthesis for indications like fracture neck of femur and various other diseases of the hip and were followed up with serial radiographs at periodic intervals to evaluate, what fraction of the total abduction at the hip was occurring at the interprosthetic joint.
  
  
  RESULTS
  In cases of intracapsular fracture neck of femur, the percentage of total abduction occurring at the interprosthetic joint at 3 months follow-up was 33.74% (mean value of all the patients), which fell to 25.66% at 1.5 years. In indications for bipolar hemireplacement other than fracture neck of femur, the percentage of total abduction occurring at the interprosthetic joint at 3 months follow-up was 71.71% (mean value) and at 1.5 years it was 67.52%.
  
  
  CONCLUSIONS
  This study shows the relative preservation of inner bearing movement in the bipolar hip prosthesis with time probably due its refined design. Further refinements are needed to make the prosthesis work better in patients of intracapsular fracture neck femur.
authors.affiliation: Department of Orthopaedics, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India.
authors.forename: Anil Kumar
authors.initials: AK
authors.lastname: Rai
authors.forename: Saurabh
authors.initials: S
authors.lastname: Singh
authors.forename: Vinay
authors.initials: V
authors.lastname: Kumaraswamy
authors.forename: Gn
authors.initials: G
authors.lastname: Khare
authors.forename: Vinit
authors.initials: V
authors.lastname: Yadav
authors.forename: Rakesh
authors.initials: R
authors.lastname: Agarwal