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

anterior interval

A normal anterior interval allows free movement of the fat pad, meniscus and patellar tendon.

anterior interval arthrofibrosis

Arthrofibrosis may 'gum' down mobile tissues, including the anterior interval, with adhesions, with consequent reduced range of motion of the knee.


Anterior interval release

To release the scar tissue the surgeon can enter the joint from the suprapatellar area above the kneecap, passing the instrument down under the intermeniscal ligament and into the area behind the patellar tendon.

Q&A-style article all about arthrofibrosis.

Arthrofibrosis and Patella Baja

This ebook explains how an abnormally low kneecap result from the inflammatory condition of arthrofibrosis

The Anatomy of Knee Flexibility

A course explaining how the knee can become stiff.

How to perform patellar mobilisations

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

Anterior interval arthrofibrosis

A brief look at how the kneecap can become tethered by scarring in the region of the 'anterior interval'.

The anterior interval

An explanation of the very important gap under the patellar tendon




Anterior interval release in Europe.


Intraarticular arthrofibrosis of the knee alters patellofemoral contact biomechanics. Mikula JD, Slette EL, Dahl KD, Montgomery SR, Dornan GJ, O’Brien L, Turnbull TL and Hackett TR. J Exp Orthop. 2017 Dec; 4: 40.

Fibrosis is a common outcome following total knee arthroplasty Abdul N, Dixon D, Walker A, Horabin J, Smith N, Weir DJ, Brewster NT, Deehan DJ, Mann DA,1 and Borthwick LA. Sci Rep. 2015; 5: 16469.

See also -


eBook - Arthrofibrosis and patella baja

Easy-to-read eBook about a complex topic.