You don't have to keep your keep completely straight. It's much more comfortable to have a slight bend in it. You don't have to worry, your knee will still extend properly when it's healed.I try to keep my leg straight when I sleep
At 7 weeks your knee isn't even 1/4 of the way healed, so being stiff is perfectly normal. Stiffness was the last thing to leave mine and I also complained about it. But, rest assured, it does go away in time. Be patient, this is a long, long recovery.
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