Osteochondritis Dissecans is an inflammatory process of the bone and cartilage of the knee due to loss of blood flow. The cause of Osteochondritis Dissecans is mostly unknown but can be due to trauma of the knee or repetitive overuse. Symptoms include vague pain and swelling with all other causes ruled out. You may also experience sensation of stiffness, instability, giving out, clicking, and locking of the knee. Your therapist will assess your knee and create a custom treatment plan including medical referral as needed.