Call for emergency medical help. If you suspect you're having a heart attack, don't hesitate. Immediately call 911 or your local emergency number. If you don't have access to emergency medical services, have someone drive you to the nearest hospital.
The most common causes of knee weakness are osteoarthritis, sprain or strain, and chronic knee pain. Other possible causes, such as injury to the knee, are more rare. Osteoarthritis 22. Sprain or strain 17. Chronic knee pain 15. Knee ligament or meniscus tear 8. Fracture of the leg 4. Bursitis 2.
Common Causes of Severe Knee Pain. Many people think knee pain only affects older people, but it can affect people of all ages. Whether it's due to arthritis or an injury, it is important to know what has caused the knee pain. Severe knee pain can lead to inflammation and mobility problems. Anyone suffering from knee pain should uncover the exact cause so that it can be treated properly.