Quadratic Pathological Knee Joint - A set of four sets of knee models, one set of normal knee joints, and three sets of degenerative lesions colour knee joints. Shows the details of human knee joint, highly detailed anatomical model is your best aid for related knowledge research Realistic Demonstration Of Lesion Structure - Introduces the characteristics of knee joint degeneration, degeneration and destruction of articular cartilage, sclerosis of subchondral bone, hyperplasia of articular margins and subchondral bone, and formation of bone boil. Detachable Model - Each knee joint can be disassembled and removed for independent observation, more convenient for learning and communication. Professional - Professionally designed anatomy, this functional model demonstrates the anatomy and mechanisms of the main joints to make it clearer to the patient or student. Realistic joint construction, real bone texture with the same weight and touch as real bone specially tailored accessories, pure hand stringing. Material - Made of environmentally friendly PVC material, durable, clear texture and realistic details, standard medical teaching model; Size: 7.5*6*15cm/2.95*2.36*5.90*5.90inch.