Total Hip Prosthesis Assisted by Computer (NAVEOS)

• Positioning of the cup in the 'security zone'. Comparison performed in immediate post-operative [ Time Frame: The measure of the positioning of the cup will be carried out on the control scanner post-operatively at 3 months ] [ Designated as safety issue: No ]
  

• Post-operative dislocation [ Time Frame: at 1 year of the occurrence of at least 1 episode of dislocation post-operatively ] [ Designated as safety issue: No ]
  propotion of Post-operative dislocation : Comparison at 1 year of the occurrence of at least 1 episode of dislocation post-operatively
  
  
• Functional Score of Harris and the score PMA [ Time Frame: at 3 month,6 month, and 12 months ] [ Designated as safety issue: No ]
  mean of Functional Score of Harris and the score PMA
  
  
• Quality of live score [ Time Frame: at 3 month,6 month,and 12 months ] [ Designated as safety issue: Yes ]
  . Quality of live score: Womac score, SF12,Oxford Score: comparison at 3 month,6 month,one year Measure : expressed as a mean
  
  
• Early sign of radiographic unsealing [ Time Frame: comparison at one year ] [ Designated as safety issue: No ]
  Early sign of radiographic unsealing : comparison at one year 2 blinded operators Measure : expressed as a mean
  
  
• Average surgical Time [ Time Frame: at inclusion ] [ Designated as safety issue: No ]
  

Hip navigation based on preoperative EOS(TM) imaging could help to improve the accuracy of cup positioning like other computer assisted hip surgery, but it would also simplify the procedure in lateral decubitus. Indeed, the registration of the controlateral antero superior iliac spine and the pubis is not necessary with this technique. The target population of the study is the one affected with primitive hip osteoarthritis for which an indication of prosthesis of total hip has been chosen Expected Result: Simplification of the procedure of navigation of the cup. Decrease in the number of cups positioned out of the "security zone" compared to the standard manual technique of cup positioning. A result of 50% of good positioning is expected with the manual technique versus 80% with the technique of navigation based on EOS(TM).

MAIN OBJECTIVE: Compare the surgical treatment of total hip prosthesis without assistance by computer and total hip prosthesis with navigation based on imaging EOSTM pre-operative Comparative clinical trial of superiority, randomized in single blind, in 2 parallel groups: -Group 1: Installation of hip prosthesis without assistance by computer -Group 2: Installation of hip prosthesis with assistance by computer based on imaging EOS(TM)