47 years old gentleman presented with complaints of pain in left hip and inability to bear weight over left lower limb.  There was shortening of left limb of about 4 cm. Patient had history of residual post-polio paralysis of left upper limb and left lower limb but patient used to walk without support. He had sustained fracture of the left hip 6 month ago which was fixed with screws.   Pre-op x-ray showed ununited fracture neck of femur with failed osteosynthesis. Thus patient was planned for hip replacement to overcome the limb length discrepancy and non-union neck of femur. As patient had post polio residual paralysis dual mobility hip replacement surgery was done to enhance the stability of hip joint. Post operative x-ray showed dual mobility hip replacement. Now patient is walking comfortably with walker and leg shortening has been corrected.