I am experiencing grating sound in knee from past 9 months. It's also hurting while sitting. Walking makes it more painful. Overall X-ray from all angles was done including the patella also nothing of concern was found .After MRI they said my acl in left knee got stretched, that was during the 5th month. Next I did shortwave diathermy and ultrasound massage and hamstring exercises, for around one month. Which did not improve my condition. Next my
vitamin d was tested and found out to be only 6ng/ml. From then I am taking vitamin d supplements and it's been 2 months but my condition is not improving. Can there be some other diseases? Also I never hurt my knees for my acl to be stretched except some yoga and shuffle dance, there was no sort of dangerous movement done by me.