Preferential sacral fracture sites in fragility fractures of the pelvis type IVb and comparison of internal fixation methods: CT-based morphological mapping and finite element analysis. - Naniwa S; Yorimitsu M; Hasegawa T; Ando T; Okuda R; Fukuoka S; Mochizuki Y; Yamakawa Y; Nakahara R; Hanakawa S; Ozaki T (European journal of trauma and emergency surgery : official publication of the European Trauma Society, 2026)