That tight band is caused by scar tissue but not the adhesions type of scar tissue. When the surgeon opens up the knee, he has to undercut the skin and superficial structures from that centre line to each side of the knee in order to get good access all round the bones. Part of the healing process is when those flaps reattach themselves to the main body of the leg. This healing creates a thin layer of scar tissue across the front and sides of the knee. But scar tissue isn't anywhere near as flexible as normal tissue so it feels like a tether or a clamp across the knee if there is any swelling and during later normal activity. It will gradually reduce in size and thickness over the following months until it reaches a point where it's not substantial enough to cause this sensation, same way as does the incisional scar in the skin. This should be regarded as pain and treated as such. In the early days, take your prescription meds. In later days, take some otc meds like paracetamol/Tylenol or ibuprofen, or even both Tylenol/ibuprofen cocktail
