Fig. 2
From: OF-Pelvis classification of osteoporotic sacral and pelvic ring fractures
Three modifiers of the OF-Pelvis classifications system for osteoporotic sacral and pelvic ring fractures. Modifier can be assigned alone or in combination and shall indicate more severe injury a) Modifier 1 fracture of the L5 transverse process b-d) Displacement at any localization e) CT shows only a fracture of the sacral ala and f) the MRI reveals additional edema in the iliac bone without fracture evidence in the CT