Sacrum: Definition, Uses, and Clinical Overview
Sacrum is a triangular bone at the base of the spine and the back of the pelvis. It connects the lumbar spine to the pelvic bones through the sacroiliac (SI) joints. Sacrum is a common focus in orthopedics, sports medicine, physical therapy, and pain medicine when evaluating low back, buttock, and pelvic pain. It is also used as an anatomical landmark for imaging, injections, and certain pelvic or spine procedures.