Image Interpretation: The biceps tendon is intact with normal fibrillar echotexture and thickness. An anechoic fluid collection is noted within the tendon sheath with isoechoic synovial thickening and marked hyperemia suggestive of bicipital tenosynovitis. No biceps tendon subluxation noted on dynamic evaluation.
Teaching Pearl: Ultrasound is one accurate and accessible tool for evaluating the extra-articular long head of the biceps tendon. Biceps tenosynovitis appears as tendon sheath fluid, synovial hypertrophy, and Doppler hyperemia, while the tendon itself may remain intact.
Because the biceps tendon sheath communicates with the glenohumeral joint, sheath fluid may reflect intra-articular pathology rather than isolated tendon disease. The scan should also assess biceps stability, subscapularis integrity, supraspinatus pathology, and the rotator interval.
References:
1. Ostrowski JL, Beaumont A, Dochterman E. Diagnostic accuracy of musculoskeletal ultrasound on long head biceps tendon pathologies. J Sport Rehabil. 2021;30(7):1098-1101. doi:10.1123/jsr.2020-0511
2. Armstrong A, Teefey SA, Wu T, et al. The efficacy of ultrasound in the diagnosis of long head of the biceps tendon pathology. J Shoulder Elbow Surg. 2006;15(1):7-11. doi:10.1016/j.jse.2005.04.008
3. Park I, Lee HJ, Kim SE, et al. Evaluation of the effusion within biceps long head tendon sheath using ultrasonography. Clin Orthop Surg. 2015;7(3):351-358. doi:10.4055/cios.2015.7.3.351