Hip dislocation is common in our context; its urgent reduction becomes a necessity to delay the onset of osteonecrosis of the femoral head. It becomes old if the reduction is not made after 28 days; at this time the reduction may be unstable or impossible due to either an association of acetabular lesion or the filling of the acetabulum with fibrosis. The aim of the work is to assess their frequency and the difficulty of their management, then to assess functionally the fate of this hip after arthroplasty