Adhesions are frond-like filaments which form in the knee in response to inflammation.
They stretch across the walls of the knee joint , binding the surfaces and limiting movement.
Initially they are easily broken with knee movement, but later the adhesion tissue matures into scar-bands and these thicken and make the knee stiff. When the knee is stiffened by adhesions the condition is called arthrofibrosis .
An 'interpretation' of a 1999 paper that gives a good overview of the subject of arthrofibrotic scarring in the knee.
An 'interpretation' of a 1994 article where the authors described their system of surgical management of arthrofibrotic scarring in the knee.