Pijls, B. G., Nieuwenhuijse, M. J., Fiocco, M., Plevier, J. W., Middeldorp, S., Nelissen, R. G., & Valstar, E. R. (2012). Early proximal migration of cups is associated with late revision in THA. Acta Orthopaedica, 83(6), 583–591. https://doi.org/10.3109/17453674.2012.745353