Subjects included were addressed to a unique physician who performed all the treatment procedure with a diagnostic of lateral epicondylitis to receive a BTX injection.

first injection was done under ultrasound control in the extensor carpi radialis brevis (ECRB). The second one if necessary was subordinated to clinical examination and focused in one or more of the following: ECRB, extensor digitorum communis, supinator.

A qualitative scale was used to define the result of the treatment procedure based on pain improvement.

Poor : no improvement Temporary : significant but temporary pain reduction Partial : permanent but partial pain reduction Good : patient no longer requesting any treatment for LE due to pain relief

Any adverse event was notified