Osteoarthritis is also known as a degenerative disease of the joint or the wear-and-tear type of arthritis. This commonly occurs in the knee, which always involves the slow tearing of the knee jointâ€™s cartilage. When this happens, the bone is bared already. It is very painful when this happens because the cartilage serves as the shock absorber of every knee movement performed. This condition usually people above the age of 50 years who start to develop the degenerative arthritis of the knee. Those who are overweight or have inherited the disease suffer significantly. But if you have acquired trauma, fractures, or damage to the ligament, you may also have degenerative arthritis of the knee.