European Journal of Molecular & Clinical Medicine

Abstract

BACKGROUND
Fracture neck of femur is a common orthopaedic problem in old age.Hip fractures are common and comprise 20% of the operative workload of an orthopaedictrauma unit.Intra-capsular femoral neck fractures account for 50% of all  hip fractures.The lifetime risk of sustaining a hip fracture is high and lies within the  rangeof 40% to 50% in women and 13% to 22% in men. Bipolar prosthesis was invented mainly to prevent the complications  of acetabular erosions and prosthetic loosening as in the unipolar hemiarthroplasty.Certain authors believed that in normal acetabulum, the cartilage – prosthesis junction has low coefficient of friction (in contrast to arthritic joint) and therefore even Bipolar prosthesis may work as unipolar arthroplasty, with movements occurring between Acetabulum and outer cup of bipolar prosthesis.
 
OBJECTIVES
Assessment of Intra– prosthetic movement in Bipolar prosthesis by radiological means and co-relating the intra-prosthetic movement with Bipolar prosthesis.This study represents the assessment of the intra-prosthetic joint movement in bipolar prosthesis done for fracture neck
of femur, at 6months and mid-term follow-up by radiological means. By this study we will be able to assess whether Bipolar prosthesis really functions as its name suggests or vice versa as the literature suggests.
 
METHODS
A prospective study with 30 patients who had fracture neck of femur were operated with bipolar hemiarthroplsty were assessed radiologically as described by Bochner et al, at immediate
 
RESULTS
The average immediate intra-prosthetic movement at immediate follow up was 54%, 42 % at 6 weeks, 30% at 6 months and 24% one year. The results were in line with recents studies and better than older studies published by verbene et al. There was significant correlation with IPJ movement
 
CONCLUSION
In this study we have radiologically assessed the intraprosthetic movements in a bipolar hemi-arthroplasty done for fracture neck of femur. Intraprosthetic movement is maintained at all intervals of follow up with 24% at one year follow up. The functional out come of subjects is proportional to the moments at intraprosthetic joint.
 
KEYWORDS; intraprosthetic movement; bipolar hemiarthroplasty;fracture neck of femur