Image Interpretation: There is a moderate amount of fluid in the retrocalcaneal bursa. The bursal tissue is hypertrophic with hyperemia noted on color doppler. The achilles tendon is intact with normal echotexture.
Teaching Pearl: When evaluating the retrocalcaneal region, use generous gel and light transducer pressure, especially in long axis, to avoid compressing the bursa and losing image quality. A neutral or slightly dorsiflexed ankle can help maintain transducer contact.
Ultrasound can identify retrocalcaneal bursal fluid, synovial hypertrophy, Doppler hyperemia, and associated Achilles insertional pathology. It's important to localize posterior heel pain precisely because retrocalcaneal bursitis, superficial bursitis, insertional Achilles tendinopathy, and calcaneal stress injury can overlap clinically.
References:
1. Page P, Manske RC, Voight M, Wolfe C. Diagnostic musculoskeletal ultrasound of the Achilles tendon. Int J Sports Phys Ther. 2025;20(2). doi:10.26603/001c.129050
2. Pass B, Robinson P, Ha A, Levine B, Yablon CM, Rowbotham E. The Achilles tendon: imaging diagnoses and image-guided interventions. AJR Am J Roentgenol. 2022;219(3):355-368. doi:10.2214/AJR.22.27632
3. Zellers JA, Bley BC, Pohlig RT, Alghamdi NH, Silbernagel KG. Frequency of pathology on diagnostic ultrasound and relationship to patient demographics in individuals with insertional Achilles tendinopathy. Int J Sports Phys Ther. 2019;14(5):761-769. doi:10.26603/ijspt20190761