📌Pes Anserinus Bursitis
Pes anserinus bursitis refers to inflammation of the bursa located deep to the conjoined tendons (pes anserinus) on the medial aspect of the knee.
✅ Anatomic Considerations
- Bursa does not communicate with knee joint cavity
- Located deep to semitendinosus, gracilis, and sartorius tendons
- Most frequently distal to joint line along distal superficial MCL and tibial metaphysis
✅ Etiology
- Associated with athletic activity
- Degenerative arthritis
✅ Imaging Findings
- Increased bursal fluid
- Thickened bursal wall
- Surrounding edema
- Abnormal enhancement
- Septated fluid collection with bursa superficial to MCL, deep to sartorius/gracilis tendons
★ Anatomic Note
- Sartorius enveloped by crural fascia layer 1
- Gracilis/semitendinosus between layers 1 and 2
- Gracilis tendon within septated fluid, sartorius more superficial
Semin Musculoskelet Radiol. 2016 Feb;20(1):12-25
Stoller's Orthopaedics and Sports Medicine:
The Knee: Includes Stoller Lecture Videos and Stoller Notes
AJR 2019; 213:1107–1116
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
© 2022 MSK MRI Jee Eun Lee All Rights Reserved.
No unauthorized reproduction, redistribution, or use for AI training.
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