Bone spurs.  Sometimes, a source of pain.
D006801:Humans; D007596:Joints / Q000503:physiopathology; D019637:Orthopedic Procedures; D010003:Osteoarthritis / Q000150:complications / Q000601:surgery; D054850:Osteophyte / Q000150:complications / Q000503:physiopathology* / Q000601:surgery; D010146:Pain / Q000209:etiology*