Myofascial pain syndromes (MPS): common syndromes and management
I built this from the library textbooks. You haven't uploaded your own textbooks yet, so when you do, I can redo it in their wording and page references. Points marked (general knowledge) are not from the retrieved textbook text.
1. Definition
MPS is a regional pain disorder. It comes from trigger points (TrPs) in skeletal muscle and the associated fascia. A trigger point is a hyperirritable spot in a taut band of muscle. It is tender on palpation and reproduces the patient's pain. It also refers pain in a fixed pattern that does not follow a dermatome. - Morgan and Mikhail's Clinical Anesthesiology, 7e, p. 2002-2003
Typical features are aching muscle pain, spasm, stiffness, and weakness. Autonomic signs such as vasoconstriction or piloerection can occur over the muscle. - Morgan and Mikhail's Clinical Anesthesiology, 7e, p. 2002
2. Clinical features of a trigger point
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Focal point tenderness
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Pain reproduced on palpation
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Muscle hardening on palpation
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Pseudo-weakness of the muscle
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Referred pain
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Limited range of motion after about 5 seconds of sustained pressure
- Scott-Brown's Otorhinolaryngology, Vol 1, Table 112.2
Other points to include:
- Active TrP: it produces spontaneous or provoked pain that the patient recognises. Latent TrP: it is tender but not spontaneously painful. After an acute injury the TrPs become latent, and later stress can reactivate them. - Morgan and Mikhail, p. 2003
- Local twitch response and jump sign (general knowledge, Travell and Simons): snapping palpation of the taut band produces a twitch, and the patient may jump.
- Aetiology: trauma, repetitive microtrauma, overuse, and prolonged static contraction, such as desk or computer work. - Harrison's Principles of Internal Medicine 22E, p. 3014
- Pathophysiology: it is poorly understood. - Morgan and Mikhail, p. 2003. The "integrated trigger point hypothesis" (general knowledge) proposes excess acetylcholine release at the motor endplate. This causes sustained sarcomere contracture, local ischaemia, and release of sensitising chemicals. Peripheral and central sensitisation follow.
- Dissenting view: Adams and Victor could not confirm the nodules or cords. Excised nodules showed no inflammation or other disease, and they call the status of the disorder "not settled." - Adams and Victor's Principles of Neurology, 12e, p. 160-161. This is useful for a critical-appraisal answer.
3. Common myofascial pain syndromes by region
| Region | Muscles and referral pattern |
|---|
| Neck and head | Trapezius (most often at the angle of the neck or the occipital insertion) causes neck pain and headache. Sternocleidomastoid (sternal and clavicular origins, occipital insertion) refers to the periauricular, facial, and frontal areas. It can also cause dizziness, ipsilateral ptosis, lacrimation, and conjunctival injection. Levator scapulae refers to the posterior neck, posterior scalp, and periauricular area. Splenius capitis and semispinalis capitis cause headache and dizziness. - Roberts and Hedges' Clinical Procedures in Emergency Medicine, p. 1255-1256 |
| Jaw and face | Masticatory muscle TrPs cause unilateral headache and ear, tooth, and TMJ pain. Myofascial pain with referral is felt beyond the muscle boundary, for example in the ear, tooth, or eye. - Roberts and Hedges; Firestein and Kelley's Rheumatology |
| Shoulder and scapula | Posterior scapular muscles are the most common site, then supraspinatus, infraspinatus, and pectoralis major. Rhomboids, serratus anterior, and subscapularis are also involved. It is often misdiagnosed as bursitis. Infraspinatus TrPs refer pain to the lateral deltoid and down the outer arm to the hand. A TrP medial to the scapula can mimic coronary pain. - Roberts and Hedges; Harrison's |
| Low back and hip | Quadratus lumborum and gluteus medius cause low back pain. Gluteal TrPs can mimic S1 radiculopathy or sciatica. Paraspinal TrPs refer to the buttock. - Morgan and Mikhail; Harrison's |
| Thoracic | Thoracic paraspinal TrPs are linked to migraine and tension-type headache. - Roberts and Hedges |
| Abdominal wall | Rectus abdominis TrPs can accompany visceral disease through somatovisceral reflex convergence. Examples are gallbladder disease on the right upper side and dysmenorrhoea on the right lower side. - Roberts and Hedges |
| Pelvic floor | A frequently overlooked cause of chronic pelvic pain. - Berek and Novak's Gynecology |
Myofascial pain most often involves the posterior neck, low back, shoulders, and chest. - Harrison's
Myofascial pain of the neck, jaw, and ear is five times more common in post-menopausal women. Malocclusion and poor deltopectoral posture are contributing factors, and stress amplifies symptoms. - Scott-Brown's, Ch. 112
4. Diagnosis and differentials
- Diagnosis is clinical. It rests on the character of the pain and on palpation of discrete TrPs that reproduce it. - Morgan and Mikhail
- Palpation techniques:
- Flat palpation: slide a fingertip across the fibres, then snap the band "like a violin string."
- Pincer palpation: roll the muscle between thumb and forefinger.
- Deep palpation: use this when the band is hidden by superficial tissue.
- Marking the point with a skin marker helps before treatment. - Roberts and Hedges
- Exclude other causes: radiculopathy, rotator cuff pathology, bursitis, angina, and visceral disease. A non-focal neurological exam is essential, and sometimes imaging is needed. - Roberts and Hedges
- Fibromyalgia: it is widespread, with tender points and non-restorative sleep. Regional MPS may evolve into fibromyalgia, and sleep should be addressed. - Harrison's
5. Management
A. Education and correction of perpetuating factors
- Posture and ergonomic correction, and attention to resting positions. - Harrison's
- Treat sleep disturbance, stress, malocclusion, and underlying osteoarthritis of the neck or low back. - Harrison's; Scott-Brown's
B. Non-invasive treatment (first line)
- Spray and stretch: spray ethyl chloride or fluoromethane from the TrP toward the referral zone, then stretch the muscle. This induces reflex relaxation and may need repeating. - Morgan and Mikhail; Harrison's
- Ischaemic compression and massage: sustained pressure on the TrP, then massage. - Roberts and Hedges; Scott-Brown's
- Heat, therapeutic ultrasound, and transcutaneous electrical stimulation (TENS). - Scott-Brown's; Roberts and Hedges
- Exercise: stretching to restore muscle length and elasticity, and range of motion work. The aim is to regain muscle length. - Morgan and Mikhail
- Biofeedback may help. - Morgan and Mikhail
- (General knowledge) Taping and cupping are used in practice too. For taping, Physiopedia cites a meta-analysis showing short-term pain reduction but no clear effect on function.
C. Pharmacological treatment
- Simple analgesics and NSAIDs (general knowledge). Use TCAs or muscle relaxants for sleep and spasm if needed. Drug treatment for chronic myofascial pain is similar to that for TMJ disorders. - Scott-Brown's
- A lidocaine patch showed similar efficacy to trigger point injection in a 60-patient RCT. - Berek and Novak's Gynecology
D. Invasive treatment (when non-invasive measures fail)
- Trigger point injection:
- Use 1 to 3 mL of local anaesthetic, for example 1% lidocaine. - Morgan and Mikhail; Harrison's
- Botulinum toxin is another option.
- Dry needling is as effective as injection and is used if the patient is allergic to local anaesthetic. - Roberts and Hedges
- Contraindications: overlying infection (absolute). Relative contraindications are bleeding disorders, anticoagulation, a proximity risk, an uncooperative patient, and inexperience. - Roberts and Hedges
- Pneumothorax risk: take care over the apical pleura when injecting the trapezius. Stabilise the scapula, and angle the needle obliquely and nearly parallel to the thorax for the levator scapulae and medial scapular muscles. - Roberts and Hedges
- Post-injection soreness, bruising, and vasovagal reactions are the common minor effects. Treat with ice for the first 24 hours. - Roberts and Hedges
E. Prognosis
The prognosis is good in most patients. It may resolve spontaneously, though many patients keep latent TrPs. - Harrison's; Morgan and Mikhail
6. Recent evidence
I found no recent evidence that contradicts the textbook approach. The evidence for needling is mixed:
- A 2025 systematic review and meta-analysis of trigger point needling (PMID 40199184).
- A 2024 meta-analysis of acupuncture in MPS (PMID 38765261).
- A 2025 systematic review of topical agents (PMID 40203136), which looked at myofascial pain dysfunction syndrome, the jaw form.
- An older Cochrane-style review of dry needling found limited, low-quality evidence. A Physiopedia summary describes moderate evidence for manual therapy and very low to moderate evidence for dry needling.
I only read the titles and basic details of these papers, not the full texts, so check them before quoting results in an exam.
7. Exam summary
MPS = trigger points + taut band + referred pain pattern + local twitch. Active TrPs hurt on their own, and latent TrPs are only tender. Treatment goes in this order:
- Remove the perpetuating factors.
- Use spray and stretch, massage, and compression.
- Add stretching and exercise.
- Use dry needling or injection if those fail.
I couldn't retrieve a referral-pattern diagram. Roberts and Hedges Figure 52.30 shows the trigger point maps, but the image link only returned a text description.
When you upload your textbooks, I can redo this as a 10-mark or 5-mark answer in their structure.