Sacrococcygeal joint

The primary function of the sacrococcygeal joint is to provide support and stability to the pelvic region, especially during activities such as walking, sitting, or standing. It acts as a flexible connection that absorbs impacts and helps to distribute weight across the lower spine and pelvis. The joint's flexibility is particularly important for facilitating movements such as bending and stretching, which are required for various daily activities. Additionally, it serves a critical role during childbirth; the slight mobility at this joint allows for changes in the pelvic shape, accommodating the passage of the baby during delivery. The sacrococcygeal joint's ability to withstand stress and strain while allowing limited movement is vital for maintaining the functional integrity of the vertebral column.

Positioned at the very end of the vertebral column, the sacrococcygeal joint is found between the sacrum and the coccyx, located in the posterior part of the pelvic cavity. The sacrum itself is situated above the coccyx and forms a part of the bony pelvis. The joint lies below the lumbar spine and above the gluteal area, making it an integral connection for the lower back and pelvis. It can be palpated for anatomical reference, as it is located just above the cleft of the buttocks, and aligns with the coccyx, providing a point of attachment for various ligaments and muscles in the region.

• The sacrococcygeal joint can become stiff or develop degenerative changes, leading to discomfort or pain, a condition often referred to as coccydynia.
• In some animals, the coccyx can be elongated, resembling a tail, whereas in humans, it serves as a vestigial structure with limited functional significance.
• The joint can slightly move during childbirth to assist in the delivery process, showcasing the remarkable adaptability of human anatomy.