Thanks for consulting. I have carefully worked through your case, and I can realize your health worries. Being your physician, I assure you not to worry as I will take care all of your medical concerns. there can be no association between the testicular pain and the knee pain anatomically. the pain in you testis may be due to some injury to testis or mild torsion can produce pain. so take mild antibiotics if the pain is there. in case it doesn t respond to the painkiller. consult a doctor to rule out torsion testis which is a dangerous condition to the testis Hope it helps. If you need further, detailed and quick assistance related to any health issues in future, feel free to ask me a question directly from my profile. Have a wonderful time ahead. Best Regards! Dr. Arunmozhi varman