Intramuscular Stimulation (IMS) or Functional Dry Needling (FDN) is a therapeutic treatment procedure that involves multiple advances of a filament needle into the muscle in the area of the body which produces pain and typically contains a ‘trigger point’. There is no injectable solution and typically the needle which is used is very thin. Most patients will not even feel the needle penetrate the skin, but once it has and is advanced into the muscle, the feeling of discomfort can vary from patient to patient.
Usually a healthy muscle feels very little discomfort with insertion of the needle; however, if the muscle is sensitive and shortened or has active trigger points within it, the subject may feel a sensation much like a muscle cramp — which is often referred to as a ‘twitch response’. The twitch response also has a biochemical characteristic to it which likely affects the reaction of the muscle, symptoms, and response of the tissue
Finding a Trigger Point
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 patient’s symptoms. Patients soon learn to recognize and even welcome this sensation as it results in deactivating the trigger point, thereby 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.
Dry needling is an effective treatment for acute and chronic pain, rehabilitation from injury, and even pain and injury prevention, with very few side effects. This technique is excellent in finding and eliminating neuromuscular dysfunction that leads to pain and functional deficits.