Fig. 1
From: Comparison of the effects of exercise with chondroitin sulfate on knee osteoarthritis in rabbits
 Macroscopic view of rabbit articular cartilage. a The femoral condyles of the Normal group knee joints had no deterioration in the cartilage. b Control group showed obvious pathological changes including cartilage proliferation, exposure of subchondral bone, and cartilage hyperplasia. c CS group had a relatively uniform area with some small craters and the appearance of cracks. d The performance characteristics of the E group are erosion of the cartilage and swelling of the femoral condyles