Use of a constrained tripolar acetabular liner to treat intraoperative instability and postoperative dislocation after total hip arthroplasty: a review of our experience - Callaghan, J J; O'Rourke, M R; Goetz, D D; Lewallen, D G; Johnston, R C; Capello, W N (Clin Orthop Relat Res, 2004)