Bone spurs, also called osteophytes, are outgrowths of bone that develop along the edges of bones, often where two or more bones meet. They can form in the back, hip, sole or heel of the foot, spine, neck, shoulder, or knee. Most bone spurs are caused by tissue damage brought on by osteoarthritis.
https://www.health.harvard.edu/bone-and-muscle-health/bone-spurs-overview

