I am a 21 year old female with a height of 5.2 feet and weight 42 kg. I am suffering from vitamin D deficiency and having pain in knees since six months. The pain mostly arises on stress on knees using stairs and disappears with rest of a few days. On knee r-rays, the lateral tubercle of intercondylar eminence is raised. My RA factor is negative, and ESR is normal on CBC. My MCH and MCHC were slightly low. Currently, I have been taking a supplement (Indrop D) once in two weeks. Why is the pain not being relieved even with a supplement? How long will it take to have my healthy knee back? Being a medical student, I need to walk a lot, and this situation is depressing me.