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Pelvis

Ilium · Ischium · Pubis · Sacrum · Hips

Ring of fused bones articulating with the femoral heads. Internal rotation of the legs is the single most important positioning detail.

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Landmarks (6)

Internally rotate the legs 15–20° from the hip — single most common pelvis repeat.
Symmetric obturator foramina = non-rotated pelvis.
Always include both iliac crests and the proximal third of both femurs.