Chondrocalcinosis of the knee refers to the presence of calcium crystals inside the knee joint. In general both knees are affected symmetrically and this disease primarily affects adults aged 40-50 years old. It causes pain in the knees which is increased with movement. The knee may be red and swollen, with a feeling of warmth. The diagnosis is suspected by an X-ray and can be confirmed if necessary by puncturing the joint where the calcium crystals are identified. Analgesics are used to relieve the pain, but a prosthesis may sometimes be necessary in case of disabling injuries.