Sciatica refers to back pain caused by a problem with the sciatic nerve. This is a large nerve that runs from the lower back down the back of each leg. When something injures or puts pressure on the sciatic nerve, it can cause pain in the lower back that spreads to the hip, buttocks, and leg.
Osteoarthritis of the shoulder is a gradual wearing of the articular cartilage that leads to pain and stiffness. As the joint surface degenerates, the subchondral bone remodels, losing its sphericity and congruity. The joint capsule also becomes thickened, leading to further loss of shoulder rotation.
Why does an osteoporosis bone fracture cause back pain? Back pain can be a sign that a compression fracture has occurred in the vertebrae - the bones that form your spine. Brittle, weak bones caused by osteoporosis are at the root of this problem. Compression fractures in the back are a major source of pain and disability for women, and some men, over 50 years old. Compression fractures in the back are also the most common type of fracture due to osteoporosis.