ACL reco. hamstring graft results is hamstring tendonitis?

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Furthermore,

I feel tight in the morning after sleep, and after sitting for a prolonged period. There is no pain in the muscle, but when the hamstring gets very tight I start to feel pain in my anterior knee.

I do stretching and massaging several times each day, and sleep with a heating pad fixed on the hamstring.

[arniar]

My hamstring becomes tense when I bend the knee. It is like I am fighting against the muscle.

What could be causing this?