I went to see a doctor last Monday. I gave him myMRI images since July. He couldn't see anything abnormal there. Also, he concluded that my knee is doing fine and the new ligament is firm. That is good news.
But regarding my hamstring, he was quite surprised to see how tight the Semitendinosus really is. He booked an ultrasonography examination and I will need to wait until January for that. He could not diagnose my problem, and said this was a rare case.
I also met a physiotherapist. His advice to me was to strengthen the hamstring since it is visible smaller on the operated leg than the other. I should take heavy weight, about 9-10 repititions, all out.