Deep Infrapatellar Bursa

bursa infrapatellaris profunda

The deep infrapatellar bursa lies between the posterior patellar ligament surface and the anterior tibial cortex, protected from the surface by the Hoffa fat pad. It is distinct from the superficial infrapatellar bursa (clergyman's knee) which lies between the ligament and the overlying skin. Deep infrapatellar bursitis produces infrapatellar pain that can be confused with patellar tendinopathy and is diagnosed on MRI or ultrasound.

Region: Knee

Biomechanics

Function & Actions

Reduces friction between the patellar ligament and the anterior tibial surface during knee flexion and extension

Clinical Relevance

Clinical Notes

The deep infrapatellar bursa can become inflamed from repetitive kneeling with the knee in a more extended position than the superficial bursa requires, producing infrapatellar pain reproduced by direct deep palpation between the patellar ligament and the tibial cortex. It is visualised on lateral knee MRI as a fluid-filled space deep to the patellar tendon.

Pathology

Common Injuries & Conditions

Deep Infrapatellar Bursitis

Inflammation between the patellar ligament and tibial cortex producing deep infrapatellar pain managed with relative rest and targeted ultrasound-guided injection.