10.4 Myofascial Trigger Points, Motor Points, and Dry Needling Techniques
Key Takeaways
A myofascial trigger point is a hyperirritable spot in a palpable taut band of skeletal muscle that is tender and can refer pain in a predictable pattern.
Active trigger points cause the patient's spontaneous pain; latent trigger points are tender and restrict movement but do not cause spontaneous pain.
The local twitch response (LTR) is a brief visible or palpable contraction of the taut band when the needle or a snapping palpation hits the trigger point.
A motor point is where the motor nerve enters a muscle, the spot where the smallest electrical stimulus produces a visible contraction.
Expect post-needling soreness for one to two days, and apply the same pneumothorax and vessel precautions as for any deep needling.
10.4 Myofascial Trigger Points, Motor Points, and Dry Needling Techniques
Quick Answer: A myofascial trigger point (MTrP) is a hyperirritable, tender spot in a taut band of skeletal muscle that can refer pain to a distant area in a recognizable pattern. Active MTrPs reproduce the patient's usual pain; latent MTrPs are tender and limit movement but do not cause spontaneous pain. Needling an MTrP often produces a local twitch response (LTR), a quick contraction of the band. A motor point is where the motor nerve enters a muscle. The 2026 ACPL outline lists trigger points and motor points under point selection, and MTrP techniques (LTR, dry needling, motor points) under acupuncture techniques.
Trigger Point Basics
Janet Travell and David Simons described myofascial pain in Myofascial Pain and Dysfunction: The Trigger Point Manual. Their criteria are still the clinical standard:
- A palpable taut band in the muscle.
- An exquisitely tender nodule in the band.
- Recognition: pressure reproduces the patient's familiar pain.
- Referred pain in the typical pattern for that muscle.
- A local twitch response to snapping palpation or needling.
- Painful limits to stretch range of motion and some weakness without atrophy.
| Type | Spontaneous pain? | Features |
|---|---|---|
| Active | Yes | Causes the patient's complaint; pressure reproduces familiar pain |
| Latent | No | Tender when pressed; stiffness, weakness, and limited range of motion |
| Satellite | Either | Forms in the referral zone of another trigger point |
Common causes include acute overload, repetitive strain, poor posture, prolonged immobility, and stress. In Chinese medicine terms, trigger points behave like Ashi points, and many lie on the Channel Sinews.
Common Referred-Pain Patterns
| Muscle | Typical referral | Nearby acupuncture points |
|---|---|---|
| Upper trapezius | Posterolateral neck, behind the ear, and the temple | GB 21 |
| Sternocleidomastoid | Forehead, around the eye, ear, and cheek | SI 17, LI 18 region |
| Levator scapulae | Angle of the neck and the medial border of the scapula | SI 14 |
| Infraspinatus | Deep front of the shoulder and down the arm | SI 11 |
| Quadratus lumborum | Sacroiliac joint, buttock, and lateral hip | BL 52 region |
| Gluteus minimus | Down the lateral or posterior leg, mimicking sciatica | GB 30 region |
| Piriformis | Buttock, hip, and back of the thigh | GB 30, Huantiao area |
| Gastrocnemius | Calf, back of the knee, and instep | BL 57 region |
Because referred pain can mimic nerve-root pain, check for true radicular signs (dermatomal numbness, reflex loss, or weakness in a myotome) before attributing symptoms to trigger points.
Locating Trigger Points
- Position the muscle with a little slack, slightly short of a full stretch.
- Use flat palpation (fingertip across the fibers against underlying bone) for muscles such as the infraspinatus, or pincer palpation (between thumb and fingers) for muscles such as the upper trapezius or SCM.
- Find the taut band, then the most tender nodule along it.
- Ask whether the pressure reproduces the familiar pain and where it spreads.
Dry Needling and MTrP Needling Technique
- Use a filiform needle long enough to reach the trigger point; the needle passes through the skin into the taut band without injecting any substance (hence "dry").
- Fast-in, fast-out (pistoning): rapid lifting and thrusting into different parts of the trigger point to provoke several LTRs. Stop when the twitches fade or the patient's tolerance is reached.
- Static (retained) needling or gentle twirling is used for sensitive patients.
- An LTR confirms that the needle has reached the trigger point. Studies by Hong and others associate LTRs with better immediate pain relief, but needling can help even without visible twitches.
- Afterward, apply pressure for hemostasis, then stretching, heat, or movement. Warn the patient that post-needling soreness for one to two days is common.
Dry needling is regulated differently in each state. Acupuncturists generally treat it as part of acupuncture practice; check your state law for the scope of practice of other professions.
Motor Points
A motor point is the spot where the motor nerve enters a muscle, usually near the middle of the muscle belly. It is the place where the smallest electrical stimulus produces a visible contraction, so motor points are used for electrical muscle stimulation. Many acupuncture points lie at or near motor points. Examples include ST 36 (tibialis anterior), LI 4 (first dorsal interosseous), GB 21 (upper trapezius), LI 15 (deltoid), and GB 30 (gluteus maximus). Needling a motor point produces a twitch. Motor points are used for muscle weakness, muscle inhibition after injury, and tight or shortened muscles.
Safety Precautions
- Thorax: trigger points in the upper trapezius, rhomboids, scalenes, and intercostal muscles lie over the lung. Use pincer grip technique or direct the needle away from the chest wall to avoid pneumothorax (Section 11.3).
- Neurovascular structures: know what lies under each muscle (for example, the sciatic nerve deep to the piriformis and the femoral vessels in the femoral triangle).
- Anticoagulants and bleeding disorders: aggressive pistoning increases bruising.
- Fibromyalgia and central sensitization: use gentler stimulation and fewer points.
- Avoid needling over infected skin, lymphedematous limbs, and areas with active cancer.
While palpating the upper trapezius, a practitioner finds a tender nodule in a taut band. Pressing it reproduces the patient's usual pain at the temple and behind the ear. How is this point best classified?
A latent trigger point, because it lies within a taut band of the muscle
An active trigger point, because pressure reproduces the patient's familiar pain
A motor point, because it lies in the muscle belly where the nerve enters
A Jing-Well point, because the pain travels along the channel upward toward the head
During dry needling of the infraspinatus, the muscle produces a brief visible contraction as the needle enters the taut band. What does this indicate?
A local twitch response, confirming the needle has reached the trigger point
Early needle shock that requires immediate removal of every needle and leg elevation
Impending pneumothorax from the needle passing through the scapula
A broken needle
Which statement best defines a motor point?
Where the motor nerve enters a muscle, so the smallest electrical stimulus causes a visible twitch
Any tender point in a taut band of muscle that refers pain when it is pressed
A point at the tendon insertion where deep tendon reflexes are tested with a reflex hammer during an exam
A Back-Shu point on the Bladder channel that regulates the tone of a muscle
A patient asks what to expect after a dry needling session for low back trigger points. Which response is accurate?
You should feel no sensation afterward, and any soreness at all means a complication that needs an urgent medical review
Soreness for one to two days is common; gentle movement and heat help, and report chest pain or breathlessness at once
Bruising is impossible with dry needling, so any mark on the skin should be reported as an injury
Avoid all movement and exercise for one week so the treated muscles can heal completely
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