Akamatsu, Y., Mitsugi, N., Hayashi, T., Kobayashi, H. and Saito, T. (2012) “Low bone mineral density is associated with the onset of spontaneous osteonecrosis of the knee”, Acta Orthopaedica, 83(3), pp. 249–255. doi: 10.3109/17453674.2012.684139.