Havelin, Leif I, et al. “Revision for Aseptic Loosening of Uncemented Cups in 4,352 Primary Total Hip Prostheses: A Report from the Norwegian Arthroplasty Register”. Acta Orthopaedica, vol. 66, no. 6, Jan. 1995, pp. 494-00, doi:10.3109/17453679509002301.