Three alternative techniques that have been used for acetabular reconstruction during total hip arthroplasty in hips with a low dislocation. A) Superior placement of the cup. The cup is placed in the false acetabulum, and the superior location of the centre of rotation of the artificial joint is accepted. B) The superolateral augmentation technique with the use of a structural graft. C) The cotyloplasty technique. Complete coverage and anatomical placement of the cup are obtained with controlled medialization. (Reprinted with permission from Hartofilakidis, G. and Karachalios, T. (2004). Total hip arthroplasty for congenital hip disease. Journal of Bone and Joint Surgery, 86A, 242–50.)