Ultrasound Measurements of the ECRB Tendon Shows Remarkable Variations in Patients with Lateral Epicondylitis

Background: Lateral epicondylitis (LE) most commonly affects the Extensor Carpi Radialis Brevis (ECRB) tendon andpatients are generally treated with injection therapy. For optimal positioning of the injection, as well as an estimation ofthe surface area and content of the ECRB tendon to determine the volume of the injectable needed, it is important toknow the exact location of the ECRB in relation to the skin as well as the variation in tendon length and location. Theaim of this study was to determine the variation in location and size of the ECRB tendon in patients with LE.Methods: An observational sonographic evaluation of the ECRB tendon was performed in 40 patients with LE. Thelength of the ECRB tendon, distance from the cutis to the center of the ECRB tendon, the length of the osteotendinousjunction at the epicondyle and the distance from cutis to middle of the osteotendinous junction were measured.Results: The average tendon length was 1.68cm (range 1.27-1.98; SD 0.177). Compared to women, the ECRB tendonof men was on average 0.12cm longer. Overall, the average distance from cutis to the center of the ECRB was 0.75cm(range 0.50-1.46cm; SD 0.210), the average length of the junction was 0.55cm (range 0.35-0.87; SD 0.130), and thedistance from cutis to middle of the osteotendinous junction was 0.73cm (range 0.40-1.25cm; SD 0.210).Conclusion: The size and depth of the ECRB tendon in patients with LE is largely variable. While there are no studiesyet suggesting sono-guided injection to be superior to that of blind injection, the anatomic variability of this studysuggests that the accuracy of injection therapy for LE might be compromised when based solely on bony landmarksand therefore not fully reliable. As a result, there is value in further studies exploring the accuracy of the ultrasoundguided injection techniques.Level of evidence: IV

کلیدواژه ها:

Anatomy ، extensor carpi radialis brevis ، Lateral epicondylitis ، Tennis elbow ، Ultrasound