Total hip arthroplasty for ankylosing spondylitis: the spine-pelvis sagittal balance and quality of life  
Gao Yi, Wang Bin, Xie Zi-kang, Shen Peng-fei, Xu Jian-da, Zheng Chong, Qu Yu-xing
Chinese Journal of Tissue Engineering Research . 2015, (4): 516 -521 .  DOI: 10.3969/j.issn.2095-4344.2015.04.005