18/05/2026
♦️ Trigger Point — Not Just a Muscle Knot
A trigger point is a hyperirritable spot within a muscle, found in a taut band of fibers. It’s painful on compression, disrupts normal muscle function, and often causes referred pain.
🔴 It’s not the whole muscle…
It’s a small focal area stuck in a persistent contraction.
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🧠 How does it develop?
Trigger points are not random — they’re linked to:
• Sarcomere level:
Localized persistent contraction → shortened sarcomeres
• Fascial system:
Stiffness + reduced glide → restricted, non-smooth movement
• Motor endplate:
Dysregulation of acetylcholine → continuous muscle activation
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⚠️ The vicious cycle:
Contraction → Ischemia → Pain → More contraction
→ Reduced oxygen supply
→ Accumulation of metabolic waste (lactic acid, bradykinin, substance P)
→ Local energy crisis
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📍 Why is the pain often “misleading”?
• Peripheral sensitization
• Central sensitization
• Referred pain (due to convergence)
🔥 Common trigger point patterns:
• Upper trapezius → occipital headache
• Levator scapulae → medial scapular pain
• Infraspinatus → lateral arm pain (mimics rotator cuff tear)
• Supraspinatus → lateral shoulder pain (mimics impingement)
• Gluteus medius → lateral hip pain
• Piriformis → pseudo-sciatica (without neuro deficit)
• Quadratus lumborum → low back + iliac crest pain
• Gastrocnemius / Soleus → calf tightness & cramps
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🧍♂️ What does the patient report?
- “I feel a knot”
- Recurrent, unexplained pain
- Limited ROM
- Stiffness
- Pain increases with activity or stress
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✋ Clinical findings:
✔️ Palpable taut band
✔️ Jump sign
✔️ Referred pain reproduction
✔️ Local twitch response
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✅ Management:
• Ischemic compression (~30 sec)
• Myofascial release
• Static stretching
• Heat (to increase blood flow) / Cold (if irritated)
• Postural correction & ergonomics
• Sleep & stress optimization
• Dry needling (if skilled)
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📈 Signs of improvement:
✔️ No taut band
✔️ No tenderness
✔️ Normal ROM
✔️ Restored strength
✔️ No recurrence
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❗ If untreated:
- Chronic pain syndrome
- Muscle imbalance
- Altered movement patterns
- Joint overload (spine, knee, shoulder)
- Central sensitization
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⚠️ Key points:
• Trigger point ≠ muscle spasm
(spasm = whole muscle, TrP = focal area)
• Not all pain = trigger point
(consider DD: radiculopathy, bursitis, tendinopathy, nerve entrapment)
• May involve fascia, not just muscle
• Strong link with nervous system regulation
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🧩 Take-home message:
Trigger Point =
Nervous system dysregulation
+ Sarcomere dysfunction
+ Ischemia
+ Fascial restriction
→ A small pain generator… with a big impact
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