About the dynamic ultrasound study of the medial collateral ligament bursa.

Three layers can be defined on the medial compartment of the knee: layer I – crural fascia; Layer II – superficial portion of the medial collateral ligament; Layer III – joint capsule and the deep portion of the medial collateral ligament.

Along the course of layer II, the medial collateral ligament bursa may become apparent when filled with fluid; as happened in this patient after an intense session of horse riding.

Coronal Fast Stir (left) and T2 weighted Mri sequences (0.3 tesla).

All of bursae are typically founded  in areas where friction takes place, such as between bony surfaces and ligaments or tendons.

The dynamic ultrasound examination better defines the fluid collection within the bursa;

If necessary, the elastosonography evalutaion allows to monitorate the evolution of fluid collection; in this patient is still evident the typical fluid appearance with three-layer colour pattern.