Influence of step width and abduction angle on necrotic femur head by three-dimensional finite element method 
Tian Feng-de, Zhao De-wei, Guo Lin, Yang Lei, Chen Bing-zhi
Chinese Journal of Tissue Engineering Research . 2012, (17): 3052 -3055 .  DOI: 10.3969/j.issn.1673-8225.2012.17.004