An anterior interval release is a surgical procedure to remove scar tissue in the 'anterior interval' - a region behind the patellar tendon.

Surgery for such scarring (arthrofibrosis) is specialist domain, and this procedure should only be carried out by a surgeon experienced in this topic.

Synonyms: 
AIR
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Anterior interval arthrofibrosis

This is a condition where scarring occurs in the space behind the patellar tendon - the 'anterior interval' - eventually contracting down and pulling the patella into an abnormally low and painful position, and limiting the knee's range of motion.

In these three images below, of the...

The anterior interval

The anterior interval is a gap between the tibia and the patellar tendon just at the top of the tibia.

anterior interval

This illustration is of the knee...

Infrapatellar contracture syndrome

Dr Peter Millett chats about his experience with infrapatellar contracture syndrome and the importance of recognising it early before the shortening of the patellar tendon becomes irreversible.

Anterior interval release - the rationale behind this surgical procedure

Dr Peter Millett discusses why knee surgeons need to be aware that arthrofibrotic scarring can occur in this area because of the position of their arthroscopic portals (cuts).

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