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.
Causes of Knee Pain and Burning Sensation. 1  The pain and burning sensation in the knees is often caused due to the damage to the structures in and around the knee joint. 2  Wear and tear of knee joint cartilage is the most common reason. 3  The other cause can be ligament tear, bursitis.