It’s been 6 weeks since I had my surgery to my acl and meniscus, today my leg popped ?

Hi doctor I’m 24 and male, and I’m taking no medication.
It’s been 6 weeks since I had my surgery to my acl and meniscus on my right leg in which I had a hamstring graft…
to day I went up the stairs a little faster than usual and a massive pop went behind my leg which was very very painful I would say 7/10 pain
It happened on my right leg where my leg bends which I think might be the Semitedinosus.
I can walk on my leg fine but I’m in pain when bending down!
What could this be?

my-knee-popped





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