Hip pain and low back pain are like two peas in a pod. Often they can occur together as the hip is right next door to the low back. There are a lot of muscles that connect between the two, both directly and indirectly. The spine can affect how the hip moves and vice versa. To make matters more interesting, throw in the sacroiliac joint to the picture. The sacroiliac joint is the connection between the hips and the sacrum, the triangular bone that lives underneath the spine and ends in the tailbone. For more information on how the hip and low back can affect each other, check out: Are My Hip Pain and Back Pain Related? – Saratoga Spine.