Background. The trials to replace head and neck hip fractures using allogenic material were undertaken nearly 100 years ago. In 1974 Baterman described the construction of bipolar prosthesis defined as intermediate type between half prosthesis and total prosthesis. Autors present biomechanical aspects of bilateral prosthesis use. Indications for unipolar and bipolar prosthesis implantation in hip fractures were based on therapeutic algorrhythm presented by american authors and "survival" scale presented by Peterborough-Cambridge center. Material and methods. Between 1999 and 2001 there were 218 hip prosthesis implantations performed, including 151 unipolar and 67 bipolar ones. For control check-up presented 47 patients after unipolar and 38 after bipolar prosthesis implantation. The average period of follow up was 26,7 months. Results. Results were interpreted using Merle d'Aubigne's and Postel's scale. The complications observed during follow up were also discussed. Conclusions. Conclusions included the prevalence of bipolar prosthesis compared to unipolar one : increased angle of hip joint mobility, lesser pain and much slower progression of degenerative changes within hip joint.