Pelvic Bones Without the Sacrum, Inferior View

Description

Oriented from an inferior aspect, the paired os coxae are presented without the sacrum, leaving the posterior margins open at the auricular surfaces and the greater sciatic notches. Each hip bone is formed by the ilium superiorly, the ischium posteroinferiorly, and the pubis anteroinferiorly, converging laterally at the acetabulum. Medially, the pubic bodies approach at the symphyseal surfaces while the obturator foramina sit inferior to the acetabula, bounded by the pubic and ischial rami. Clear landmarks. An inferior view like this is the one you reach for when teaching the pelvic outlet and when explaining why pelvic fracture patterns track along ring structures, from the pubic rami anteriorly to the ischial spine and tuberosity posteriorly. Removing the sacrum isolates the hip bones so the relationship between the greater and lesser sciatic notches, the ischial spine, and the ischiopubic ramus reads cleanly, which matters when correlating physical exam palpation, pudendal nerve blocks at the ischial spine, or the bony constraints relevant to obstetric and trauma discussions. The acetabular rims also frame common orthopedic language for column and wall injuries. Use this plate in gross anatomy labs and pelvic anatomy lectures to support 3D orientation of the ilium, ischium, and pubis, and in orthopedic or trauma publications describing pelvic ring stability, pubic ramus fractures, or acetabular approach planning. It also fits well in patient education materials on hip joint articulation where the acetabulum needs to be shown without the visual noise of the vertebral column. Anatomical accuracy verified by SciePro's Medical Advisory Board.