Sakai, Takashi, Nobuhiko Sugano, Kenji Ohzono, Minoru Matsui, Kazuo Hiroshima, and Takahiro Ochi. 1998. “MRI Evaluation of Steroid- or Alcohol-Related Osteonecrosis of the Femoral Condyle”. Acta Orthopaedica 69 (6):598-602. https://doi.org/10.3109/17453679808999263.