Osteoarthritis is also known as degenerative joint disease. It is a condition in which the protective cartilage that cushions the tops of bones degenerates, or wears down. This causes swelling and pain. It may also cause the development of osteophytes, or bone spurs. Osteoarthritis of the spine is a breakdown of the cartilage of the joints and discs in the neck and lower back. Sometimes, osteoarthritis produces spurs that put pressure on the nerves leaving the spinal column. This can cause weakness and pain in the arms or legs.