The articularis genu is a small muscle slip deep to the vastus intermedius that attaches to the knee joint capsule and the suprapatellar pouch. Its sole function is to pull the suprapatellar pouch superiorly during knee extension, preventing the synovial tissue from being pinched between the femur and patella during full extension. Its failure after knee surgery or from adhesions produces suprapatellar pouch impingement contributing to post-operative knee stiffness.
| Origin | Anterior surface of the distal femur — a small muscle slip from the distal vastus intermedius |
|---|---|
| Insertion | Superior margin of the knee joint capsule and suprapatellar pouch |
| Nerve Supply | Femoral nerve (L2, L3, L4) |
| Blood Supply | Lateral circumflex femoral artery |
| Actions | Retracts the suprapatellar pouch during knee extension preventing its impingement between the femur and the patella |
|---|
Without the articularis genu actively retracting the suprapatellar pouch during knee extension, the synovial tissue would fold into the joint and be progressively nipped, producing inflammation, pain, and eventual suprapatellar fibrosis restricting extension.
Arthrofibrosis of the knee — pathological scarring of the joint that severely restricts range of motion — involves the suprapatellar pouch and can obliterate it completely. The articularis genu's failure to retract an already scarred pouch perpetuates the stiffness. Manipulation under anaesthesia and arthroscopic lysis of adhesions target the suprapatellar pouch as a primary site of arthrofibrosis.
The articularis genu is not individually palpable — it lies deep to the vastus intermedius and is only identifiable on surgical dissection or MRI.
Post-surgical suprapatellar fibrosis from articularis genu failure to retract the inflamed pouch producing progressive knee extension loss, managed with manipulation under anaesthesia and arthroscopic adhesiolysis.
This website uses cookies to enhance your experience. Some are essential for site functionality, while others help us analyze and improve your usage experience. Please review your options and make your choice.
If you are under 16 years old, please ensure that you have received consent from your parent or guardian for any non-essential cookies.
Your privacy is important to us. You can adjust your cookie settings at any time. For more information about how we use data, please read our privacy policy. You may change your preferences at any time by clicking on the settings button below.
Note that if you choose to disable some types of cookies, it may impact your experience of the site and the services we are able to offer.
Some required resources have been blocked, which can affect third-party services and may cause the site to not function properly.
This website uses cookies to enhance your browsing experience and ensure the site functions properly. By continuing to use this site, you acknowledge and accept our use of cookies.
