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.
Recovery: This is one of the longer lasting causes of knee pain and it can take anywhere from a few weeks to 2 years to settle. Find out more: Osgood-Schlatters-Disease. 4) Arthritis. This is the most common of the causes of knee pain in people over the age of 50. Causes: It is caused by wear and tear to the cartilage that lines the joint, leading to bone on bone contact. It is more common in women and in those who have previously injured their knee or had knee surgery.