Proximal femoral anti-rotation nail Ⅱ fixation repairs intertrochanteric fracture: the importance of unarmed guided needle placement 
Dou Qing-yin, Hu Hong-yong, Liang Xu-qiang
Chinese Journal of Tissue Engineering Research . 2015, (48): 7784 -7789 .  DOI: 10.3969/j.issn.2095-4344.2015.48.013