Dysport® Injection in the Treatment of Chronic Lateral Epicondylitis

Inclusion Criteria: * Pain: pain will be assessed as the physician touches lateral epicondyle or passively flexing the patient's wrist and while the patient extends his/her wrist or 3rd finger against resistance. Individuals who fulfill two or more of above will be considered to have lateral epicondylitis. * Symptom duration: should be at least 6 months. * Previous trial of complete course of physiotherapy and corticosteroid injection. Exclusion Criteria: * Rheumatoid arthritis * Generalized polyarthritis * Local elbow arthritis * Simultaneous medial epicondylalgia * Bilateral lateral epicondylitis * Neurologic deficits (abnormal light touch sensation, deep tendon reflexes abnormality, radicular pain, radial nerve entrapment, signs of nerve root compression, decreased muscle force, multiple sclerosis, seizures) * The use of corticosteroid in last 30 days * Simultaneous use of drugs other than acetaminophen or physical therapy in the course of study * Pregnancy * Breast-feeding * Previous hand surgery * Having a hobby or job that needs finger extension