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.
What Causes Shoulder Pain? The shoulder is a ball and socket joint with a large range of movement. Such a mobile joint tends to be more susceptible to injury. Shoulder pain can stem from one or more of the following causes: Strains from overexertion; Tendonitis from overuse; Shoulder joint instability; Dislocation; Collar or upper arm bone fractures; Frozen shoulder; Pinched nerves (also called radiculopathy) How Are Neck and Shoulder Pain Diagnosed? X-rays: Plain X-rays can reveal narrowing of the space between two spinal bones, arthritis-like diseases, tumors, slipped discs, narrowing of the spinal canal, fractures and instability of the spinal column.