Low back pain is one of the most common reasons patients see primary care doctors. To understand this condition, it’s ...

Medically reviewed by Brigid Dwyer, MD The lumbosacral joint, also called L5-S1, is a term used to describe a part of the ...

in the sacral region. There are 3 to 5 coccygeal vertebrae, which are fused as one bone and known as the coccyx (commonly known as the tailbone), in the coccygeal region. Feature Articles and Video ...