An abnormal ratio of the Omega 6 and Omega 3 fatty acids may be an indicator of inflammation which is associated with knee pain. You can get your ratio tested with a blood spot test you can do at home.
Omega-6: omega-3 PUFA ratio, pain, functioning, and distress in adults with knee pain
The Clinical Journal of Pain — | January 23, 2018
Sibille KT, et al. – On the basis of recommended and typical ranges of the omega-6 (n-6):omega-3 (n-3) ratio, researchers investigated if in adults with knee pain, those with a high n-6:n-3 ratio would have greater pain/functional limitations, experimental pain sensitivity, and psychosocial distress compared with those with a low n-6:n-3 ratio. Findings illustrate an association of a high n-6:n-3 ratio with greater clinical pain/functional limitations, experimental pain sensitivity, and psychosocial distress.