Usually, X-rays or other scans, such as a CAT or MRI, may be required to show the extent of the damage and to help in planning treatment. Sometimes such inspection is the only way to determine the underlying cause of the pain.
Arthroscopy may be needed to inspect the joint in cases where meniscus problems are diagnosed, and often to repair the problem at the same time.
If a malignancy is suspected, the appropriate investigation protocol is followed, usually involving a consulting oncologist.
What is knee pain?
Causes of knee pain
Do you know the cause of your knee pain?
(Dr AG Hall)