Myofascial pain syndrome (MPS) is a syndrome that is different from fibromyalgia. It is characterized by trigger points which are localized hyperexcitable painful areas inside muscles or fasciae. These trigger points produce intense pain, which can be localized or referred. Restricted movement of muscles and the presence of taut bands and tender nodules are common features of MPS. The taut bands and tender nodules respond immediately to a trigger point injection. Effective local anesthetics include 0.5-2 cc of 0.5% of procaine, 0.25% of bupivacaine, or 1-2% of lidocaine.
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