Study to Assess the Efficacy and Safety of Dysport® in Upper Back Myofascial Pain Syndrome

A Phase II Multicentre Multinational Prospective Randomised Double-blind Placebo-controlled Study Assessing the Efficacy and Safety of a Single Application of Three Doses of Dysport® in Patients With Upper Back Myofascial Pain Syndrome

The main purpose of this study is to determine which is the best dose of a drug known as Dysport to give when treating one's type of upper back pain. The study will also examine the side effects of this treatment and its overall effect on one's disorder.

Inclusion Criteria:

• Moderate-severe pain in upper back
• Myofascial pain syndrome for more than 6 months
• Active trigger points in upper back

Exclusion Criteria:

• Fibromyalgia and other non-myofascial pain conditions of upper back
• Duration of myofascial pain syndrome no longer than 24 months
• Steroid injections during previous 3 months
• Anaesthetic injection at trigger points during previous 1 month