There’s a more easy test (Though to some degree much less reputable). The typical basic exam for any tendinitis is to easily pull firmly on the tendon. In the situation of tennis elbow, This implies resisted extension from flexion Rotator Cuff Tendinitis: Often known as impingement syndrome, affects the tendons https://www.theorthopaedicandpainpractice.com/why-do-my-outer-elbows-hurt/