Patellar tendon post surgery

Hi,

I'm 7 weeks post surgery for a sheared patellar tendon.

I've started physio just over a week ago and have removed my brace just yesterday.

I have about 50 degrees of flex in my knee.

My question is. When I walk I feel like there is a tight strap across the top of my knee. I feel like this is possibly reducing the flex in my knee.

Please could someone tell me what the possible cause is for this tight sensation?

Many Thanks
Burty1