What’s Causing Knee Pain on the Outer (Lateral) Part of Your Knee?
Pain on the outer (or lateral) part of the knee can be caused by an injury. It may also be the result of inflammation in a band of tough fibrous tissue that runs down the outside of the thigh, and attaches to the front of the tibia (shin bone). Pain in this area may also be caused by arthritis.
Source: healthline
