Case ReportPublished 7 October 2026The “Sandwich” technique using a lateral locking plate and intramedullary reconstruction plate with bone cement for osteoporotic proximal humerus fractures: a case seriesYuqiang Wang · Yang Lv · Ziyan Zhang · Xuedi Sun · Shijie Wei · Chengdong PiaoFrontiers in Surgerydoi 10.3389/fsurg.2026.1745435