The strain at bone-implant interface determines the effect of spinopelvic reconstruction following total sacrectomy: a strain gauge analysis in various spinopelvic constructs. oleh Yan Yu, Rui Zhu, Zhi-Li Zeng, Yong-Wei Jia, Zhou-Rui Wu, Yi-Long Ren, Bo Chen, Zu-Quan Ding, Li-Ming Cheng