Adhesions are frond-like filaments which form in the knee in response to inflammation and/or prolonged immobilisation of the knee.

Adhesions tend to form in the suprapatellar pouch above the kneecap, in the envelope-like bursae below the kneecap and in the soft-tissue gutters around the sides and back of the joint.
Adhesions limiting range of motion
The sticky strands pull adjacent soft tissues together, binding the surfaces and limiting movement.
Initially they are easily broken with therapeutic knee movement - such as patellar mobilisations and manipulation under anaesthesia - 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.
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CLINICAL PUBLICATIONS
Update on the risks of complications after knee arthroscopy. Pajalic KF, Turkiewicz A and Englund M. BMC Musculoskelet Disord. 2018; 19: 179.
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