I have pain on the outside of my right knee, hurts whenever I bend it. What could this be? (53 yr old female)

3 common causes. Common causes of knee pain in 50 yr olds without history of injury include tendinitis , early arthritis and degenerative tears of the meniscus. Pain that interferes with activity should be investigated with a clinical exam and possibly x-rays. Mri scans are not often necessary initially .