Impingement of the knee joint refers to a pinching of the mucous membrane or parts of the ligament in the so-called notch. This is usually associated with Hoffaitis (inflammation of the Hoffa's fat body).
The notch can be constricted by osteophytes and offer too little space for the anterior cruciate ligament and the mucous membranes. These impingements lead to further swelling and inflammation of the mucosa with the formation of a hydrops (inflamed mucosal plug), which leads to a further impingement. This impingement occurs very frequently after anterior cruciate ligament surgery. Statistically after 1 - 2 % of all cruciate ligament plastics.
Pain and swelling on the front of the knee joint. Pain on hyperextension. In severe cases, inhibition of extension.
The treatment of choice is arthroscopic notchplasty and removal of the hydrops. This very reliably eliminates the symptoms.