I'm having that problem along with major leg and feet crampso that last a long time .
Hello and welcome to the medhelp forum. I can understand your health related anxiety. There could be various causes for this knee numbness including localized and systemic. Check with an orthopaedician to rule out kneecap dislocation, inflammation of the overlying bursa or attached tendon heads, any strains or sprains. Bursitis is usually triggered by trauma, overuse, gout or rheumatoid arthiritis. After a complete local examination, you will need assessment by a physician for autoimmune disorders like lupus particularly if you have fatigue, pain and swollen joints. The management would depend on the diagnosis. Wishing you all the best.