Trigger point injection is a therapeutic procedure that involves multiple advances of a small filament needle and injection of a topical anesthetic such as lidocaine into the muscle that produces pain and typically contains a trigger point. Most patients will not even feel the needle penetrate the skin, but once it advances into the muscle, the discomfort can vary from patient to patient.
The patient may only feel the cramping sensation locally or they may feel a referral of pain or similar symptoms for which they are seeking treatment. A reproduction of their pain can be a helpful diagnostic indicator of the cause of the symptoms. Patients soon learn to recognize and even welcome this sensation, as it results in deactivation of the trigger point, reducing pain and restoring normal length and function of the involved muscle. Typically, positive results are apparent within 2–4 treatment sessions but can vary depending on the cause and duration of the symptoms, overall health of the patient, and experience level of the practitioner.
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