Dry needling is one of the few treatments in physiotherapy where the patient can feel something specific happen. The muscle twitches — an involuntary, unmistakable contraction — and then it lets go.
The question is what actually just happened. Because “releasing a knot” is a description, not a mechanism.
First, what dry needling is not
Dry needling is not acupuncture. It uses the same filiform needles, which is why the confusion persists, but the reasoning is entirely different.
Traditional acupuncture selects points based on a system of meridians and energy flow. Dry needling selects points based on Western anatomy — specifically, palpable taut bands within skeletal muscle, and the anatomical location of the structure being targeted.
“Dry” distinguishes it from “wet” needling — injection of a substance. Janet Travell’s work in the mid-twentieth century found that the needle insertion itself produced much of the therapeutic effect, independent of what was injected. Hence dry.
What a trigger point is
A myofascial trigger point is a hyperirritable spot within a taut band of skeletal muscle. It is tender on compression, produces a characteristic referred pain pattern, and often produces a local twitch response when the band is snapped or needled.
The leading explanation is the integrated hypothesis, developed by Simons and refined since. The proposed sequence:
Excessive acetylcholine release at the motor endplate → sustained sarcomere shortening in a small region of the muscle fibre → local compression of capillaries → reduced local blood flow → energy crisis in that segment → release of sensitising substances → further acetylcholine release.
A self-sustaining local loop. This model is a hypothesis, not settled fact — the trigger point literature remains genuinely debated — but it accounts for the clinical findings better than the alternatives.
The four mechanisms
1. Mechanical.
The needle physically disrupts the contracted region. The local twitch response — that involuntary jump — is thought to reflect a spinal reflex arc triggered by needling the taut band. Electromyographic studies have shown that trigger points display abnormal spontaneous electrical activity, and that this activity decreases following a local twitch response.
Practically: the needle interrupts the loop that is sustaining the contraction.
2. Biochemical and immune.
This is the most interesting evidence. Jay Shah and colleagues at the National Institutes of Health used microdialysis to sample the biochemical environment directly inside active trigger points.
They found significantly elevated concentrations of substance P, calcitonin gene-related peptide (CGRP), bradykinin, serotonin, tumour necrosis factor-alpha and interleukin-1beta — an inflammatory, pain-sensitising milieu — compared with normal muscle and with latent trigger points. Local pH was also lower.
Following a local twitch response, concentrations of several of these substances decreased.
Alongside this, the needle creates a controlled microtrauma. This recruits a normal local inflammatory and healing response: mast cell degranulation, local vasodilation, immune cell migration, and initiation of tissue repair signalling. Blood flow to a region that was ischaemic is restored — which addresses the energy crisis that was sustaining the problem.
3. Neurological — segmental.
Needling stimulates A-delta and C fibre afferents. This input reaches the dorsal horn of the spinal cord and produces segmental inhibition, reducing transmission of nociceptive input from that spinal level. The gate control principle, applied deliberately.
It also reduces peripheral sensitisation by clearing the sensitising chemicals described above, and can reduce central sensitisation by removing a persistent nociceptive input that has been driving the system.
4. Neurological — descending.
Needling activates descending inhibitory pathways from the periaqueductal grey and rostral ventromedial medulla, involving endogenous opioid, serotonergic and noradrenergic systems. This is part of why needling one area can produce widespread, and sometimes systemic, pain relief.
What it feels like, honestly
A slight prick on entry, usually less than expected. Then, when the taut band is engaged, a deep cramping ache and often a visible twitch. This is normal and is generally the sign that the target has been located.
Post-needling soreness for 24 to 48 hours is common — similar to muscle soreness after training. Bruising occurs occasionally. When performed by a trained practitioner with knowledge of the underlying anatomy, serious adverse events are rare.
Certain regions require particular care — notably around the thorax, where pneumothorax is a recognised, rare risk. Practitioner training and anatomical knowledge are not optional.
What the evidence supports
The evidence for dry needling is best characterised as moderate quality, showing meaningful short-term reductions in pain and improvements in range of motion across a range of musculoskeletal conditions.
The long-term evidence for dry needling as a standalone treatment is considerably weaker.
This is not a criticism of the technique. It is a description of what it is for. Dry needling reduces pain and restores range so that you can load the tissue. The loading is what changes the trajectory.
How we use it at Longevity Physio Studio
At our Eagle Heights clinic on Tamborine Mountain, dry needling is one tool within a plan that always includes progressive strengthening.
If needling is producing relief that lasts a week and then fades, that tells us something useful: the underlying capacity problem hasn’t been addressed. That’s a prompt to change the program, not to book more needling.
Book an assessment
Dry needling is not for everyone and not for every problem. An assessment will establish whether your presentation is one it is likely to help.
Longevity Physio Studio, Eagle Heights, Mt Tamborine — serving Tamborine Mountain, North Tamborine, Canungra and the Gold Coast hinterland. Book an assessment.
