The twelfth rib is the shorter of the two floating ribs (with the eleventh), articulating only with the T12 vertebral body and having no anterior attachment — it is entirely free-floating in the posterior flank musculature. It marks the posterior boundary of the thoracic cavity and the superior boundary of the posterior flank. The kidney lies immediately anterior to the twelfth rib in the retroperitoneum.
Costovertebral angle (CVA) tenderness by percussion at the twelfth rib lateral to the erector spinae indicates renal inflammation or infection (pyelonephritis). Posterior flank incisions for renal and adrenal surgery use the twelfth rib as an anatomical landmark, with the rib occasionally removed for improved access. Twelfth rib fractures from posterior rib trauma indicate significant force and are associated with renal and adrenal injuries.
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