The pelvis is considered the “cornerstone” of the body. It has to hold up your spine, as well as coordinate your legs through your hip joints. The sacroiiac joints at the back of the pelvis can often be stiff or have too much movement, and be “out of alignment”. This can be caused by a fall, from pregnancy, postural problems, or even a sport. Either way, it can be the source of a lot of pain and make it very difficult to walk, turn in bed or even get in or out of a car. You may feel pain over the low back or sacroiliac joints, or even into the groin or radiating as far as the knee.