Thanks for writing to us.
The burning sensation in the knee is more likely is related to a vitamin B 12 deficiency or electrolyte imbalance
or a thyroid disorder
. A ligament injury
in the area is not likely. You can start with appropriate supplements and see if these improve.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Rakhi-Tayal