The normal hip has a tight fit and the smooth cartilage surfaces of the ball and socket slide against each other with minimal friction. (ivghospitals.com)
In osteoarthritis there is gradual deterioration and loss of the smooth cartilage surface of the joints. (theveterinaryexpert.com)
Osteochondritis dissecans (OD or OCD)-RRB- or osteochondrosis (OC) is a defect on the smooth cartilage surface within one or more joints. (glenerinanimalhospital.com)