Orthopedic Board Prep: Lateral Epicondylitis & ECRB Pathology MCQ

Key Takeaway

The primary source of pathology in lateral epicondylitis, commonly known as tennis elbow, is the origin of the Extensor Carpi Radialis Brevis (ECRB) tendon. Specifically, its deep fibers, located just distal and anterior to the lateral epicondyle, are most frequently affected. Precise localization of tenderness to this area confirms the diagnosis.