Preoperative bone mineral density quantitatively assessed by Hounsfield units is associated with failed back surgery syndrome after lumbar fusion surgery: a retrospective study. - Qiu, Longlong; Xu, Haocheng; Yu, Liming; Chen, Xiaojie; Qu, Junwei; Xia, Xinlei; Zheng, Chaojun; Chen, Qiwang (Asian Spine Journal, 2025)