Logan Steele
Muscle trigger points, also known as myofascial trigger points, are hyperirritable spots in skeletal muscles that are associated with palpable nodules or knots in taut bands of muscle fibres. They are a common cause of musculoskeletal pain and can develop anywhere in the body, but are most commonly found in the back, neck and shoulders. Trigger points can cause local pain and tenderness, as well as referred pain in broader areas, sometimes distant from the trigger point itself. This referred pain can manifest as tension headaches, toothaches, earaches, or low back pain, among other symptoms. While the exact mechanisms of trigger point formation are not fully understood, acute or repetitive microtrauma, intense exercise, and strenuous activity are believed to contribute to their development. Treatment options for trigger points include trigger point injections, physical therapy, massage therapy, and stretching exercises.
| Characteristics | Values |
|---|---|
| Definition | Hyperirritable spots in the skeletal muscle |
| Formation | Acute or repetitive microtrauma, mechanical stimuli, chemical mediators, excessive release of acetylcholine |
| Symptoms | Pain, weakness, headaches, toothaches, earaches, stiffness, fatigue, aches |
| Treatment | Trigger point injections, physical therapy, massage therapy, myofascial release, spray and stretch technique, ultrasonography, manipulative therapy |
| Prevalence | Very common, occur in about 85% of people at some point in their lives |
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What You'll Learn
Trigger points are hyperirritable spots in skeletal muscle
Trigger points are associated with acute or repetitive microtrauma, which causes stress on muscle fibres and can lead to the formation of these points. They produce pain locally and in referred patterns, often accompanying chronic musculoskeletal disorders. This referred pain can manifest as tension headaches, toothaches, earaches, or low back pain. The pain can be felt immediately upon palpation of the trigger point and can cause a local twitch response, which is different from a muscle spasm as there is no contraction.
Trigger points are a topic of ongoing controversy, as there is limited data to support a scientific understanding of the phenomenon. However, the concept provides a framework to address certain musculoskeletal pain. The trigger point model suggests that unexplained pain often radiates from these points of local tenderness to broader areas, sometimes distant from the trigger point itself. Practitioners claim to have identified reliable referred pain patterns that associate pain in one location with trigger points elsewhere.
Various treatment modalities are used to inactivate trigger points, including the Spray and Stretch technique, ultrasonography, manipulative therapy, and injection. Trigger point injection (TPI) is one of the most effective treatments, involving the injection of local anaesthetic, corticosteroid, or botulinum toxin. TPI is commonly used alongside physical therapy and stretching exercises to alleviate pain and improve range of motion in the affected muscles.
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Trigger points are palpable nodules in taut bands of muscle fibres
Trigger points (TrPs) are hyperirritable spots in the skeletal muscle, palpable as nodules in taut bands of muscle fibres. They are associated with local twitch responses and referred pain, which is often distant from the trigger point itself. Direct compression or muscle contraction can cause jump signs, local tenderness, and referred pain. The jump sign is a characteristic behavioural response to pressure on a TrP, where the patient may wince or cry out with a response seemingly out of proportion to the pressure applied.
Trigger points are typically diagnosed through manual palpation, where a physician will feel for a taut band and a hard nodule. The patient's expressions of pain and visual observations also assist in diagnosis. Palpation of the trigger point will reproduce the patient's complaint of pain, and the pain may radiate in a distribution of the muscle and/or nerve. This referred pain is a key characteristic of trigger points, where pain in one location is associated with trigger points elsewhere.
Trigger points are classified as active or latent, with active trigger points causing pain at rest. They are often associated with chronic musculoskeletal disorders and can lead to a decreased range of motion in the affected muscles, including those in the neck, shoulders, and pelvic girdle. Trigger points may also manifest as tension headaches, tinnitus, temporomandibular joint pain, decreased range of motion in the legs, and low back pain.
Various treatments are available for trigger points, including injection therapy, manipulative therapy, and ultrasonography. Trigger-point injection has been shown to be one of the most effective treatments, providing prompt relief of symptoms.
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Trigger points can be treated with trigger point injections
Trigger points are hyperirritable spots in the taut bands of skeletal muscle fascia. They can cause local pain and pain in other areas of the body. Trigger points can develop after acute trauma or repeated micro-trauma, leading to stress on muscle fibres. They can also cause stiffness and decreased range of motion.
Trigger point injections (TPI) are a common and generally safe way to treat myofascial pain caused by trigger points. TPIs are often used when other treatments, such as pain medication, physical therapy, massage therapy, myofascial release, and heat therapy, have not worked. They can be used alongside physical therapy and stretching exercises to alleviate pain.
TPIs are usually administered by a healthcare provider or pain specialist. Before recommending a TPI, the provider will perform a thorough physical exam and rule out other possible causes of pain, such as muscle strain, structural causes, and issues with the spinal column.
During the procedure, the clinician will insert a needle attached to a syringe at a 30-degree angle into the trigger point. They will then repeatedly insert and retract the needle in multiple directions until muscle twitching has stopped or the muscle feels relaxed. If an injection is used, the clinician will aspirate to ensure the needle is not in a vascular structure before injecting the selected solution. The most common side effect is temporary discomfort or numbness around the injection site, which can be treated with over-the-counter medications and ice packs.
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Trigger points can cause referred pain
Trigger points are hyperirritable spots in the taut bands of skeletal muscles' fascia. They are palpable nodules that can be felt through the skin and can cause local and referred pain. This referred pain is an important characteristic of trigger points, differentiating them from tender points, which are associated with pain only at the site of palpation.
Trigger points can cause pain in a specific muscle that radiates to another area of the body. For example, a trigger point in the trapezius muscle in the upper back and shoulder region can refer pain up towards the head and neck, leading to tension headaches or even migraines. This referred pain can be caused by direct compression or muscle contraction, resulting in a local twitch response.
The pain from trigger points is often described as spreading or radiating. It can accompany chronic musculoskeletal disorders and may be a result of acute trauma or repetitive microtrauma, leading to stress on muscle fibres and the formation of trigger points. Trigger points can also develop in the myofascia, primarily in the centre of a muscle belly where the motor endplate enters.
Trigger points are typically treated through various modalities, including injection, manipulative therapy, osteopathic manual therapy, transcutaneous electrical nerve stimulation, massage, heat application, and acupressure. Trigger point injections, for instance, involve injecting a special solution into the trigger points to increase blood flow and relax the affected muscle.
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Trigger points are associated with fibromyalgia
Trigger points are hyperirritable spots in the taut bands of skeletal muscle fascia. They produce local and referred pain and are often associated with chronic musculoskeletal disorders. Acute or repetitive trauma to muscle fibres can lead to the development of trigger points, which can cause regional, persistent pain and a decreased range of motion in the affected muscles.
The exact cause of these sensitivities is unknown, but it is related to muscle spasms, which cause a lack of oxygen and blood flow, leading to a buildup of acid and carbon dioxide, resulting in increased pain and further spasms. Treatment for fibromyalgia and its tender points involves a combination of medications, stress management, exercise, hydrotherapy, and rest.
Trigger point injections are one of the most effective treatment modalities to inactivate trigger points and provide prompt relief. Therapeutic massage can also help ease muscle pain, tension, spasms, and stress associated with fibromyalgia. Moist heat applied to the muscles twice daily can reduce deep muscle pain and stiffness.
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Frequently asked questions
Muscle trigger points are hyperirritable spots in the skeletal muscle. They are associated with palpable nodules in taut bands of muscle fibres. They are often referred to as "muscle knots".
Acute or repetitive microtrauma can lead to the development of stress on muscle fibres and the formation of trigger points. Exhaustion and strain on muscle fibres can also lead to trigger points forming in your body.
Trigger points can cause pain and weakness in the associated structures. They can also cause referred pain, which is when pain spreads to another area. For example, a knot in the shoulder muscle can cause pain in the neck and head.
A physical examination is usually carried out to diagnose muscle trigger points and rule out other possible causes of pain. This involves considering symptoms, pain patterns and manual palpation.
Trigger point injections are a common treatment method. They often involve injections of local anaesthetic with or without corticosteroid or botulinum toxin. Physical therapy and stretching exercises are also used alongside trigger point injections to alleviate the pain.
