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 knee pain. Knee pain can be a symptom of many different conditions. A doctor will suggest treatment based on the condition causing your pain. They might: refer you to hospital for a scan or specialist treatment, for example surgery; prescribe medication or physiotherapy; Use these links to get an idea of what can be done about knee pain.