Anterior interval arthrofibrosis is the condition of abnormal scarring in the 'anterior interval' - the space below the kneecap and behind the patellar tendon.

The scarring 'ties down' the patellar tendon, and makes the knee stiff.


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A brief but high value eBook - fully illustrated - showing how to keep the tissues around the kneecap supple.

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...


A very popular and comprehensive coverage of the topic of arthrofibrosis (internal scarring in the knee joint) from Dr Frank Noyes of the Cincinnati Sportsmedicine and Orthopaedic Center.

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).