Heijnens, L. J. M., Halma, J. J., Gaalen, S. M. van, & Gast, A. de. (2014). Poor intermediate-term survival of the uncemented Optan anatomically adapted femoral component. Acta Orthopaedica, 85(4), 363–367. https://doi.org/10.3109/17453674.2014.934185