Had A Cold Two Weeks Ago, Pain In Knee Joints.

Had a cold two weeks ago, pain in knee joints. Right knee cleared, left knee ache remained, now pain has spread down leg. Pain now also around shin varying in intensity. Any idea what the problem can be? Could it be an infection relating to cold? Doctor said my knee pain was beginning of arthritis. But as pain is now affecting my lower leg wonder if that diagnosis was right. Knee felt warmer than good one