Ultrasound-Guided Fascial Hydrorelease for Persistent Pain After Hamstring Injury (PMID: 40843849)
Research Question
Can ultrasound-guided fascial hydrorelease (HR) reduce persistent pain after hamstring injury, and what role does fascial dysfunction around neural structures play in chronic post-injury pain?
This study investigated both the clinical effectiveness of hydrorelease and the possible mechanism behind persistent pain after muscle healing.
Methods
This was a small clinical case series involving patients with chronic post-hamstring-injury pain.
Key details:
7 patients (aged 17–49 years)
Persistent pain ≥8 weeks after hamstring injury
Local tenderness and ultrasound-confirmed fascial thickening around the aponeurotic fascia (APF)
Intervention:
Ultrasound-guided fascial hydrorelease (HR)
Injection of 6.0 mL saline + low-dose lidocaine (0.17%)
Targeted peri-aponeurotic loose connective tissue, including regions near the posterior femoral cutaneous nerve (PFCN)
Outcomes measured:
Pain intensity using Numerical Rating Scale (NRS)
Hamstring tightness using passive straight leg raise (SLR)
Ultrasound changes in fascial structure
Key Findings
The study showed a strong clinical response following fascial hydrorelease.
Main findings included:
Pain scores dropped dramatically:
From NRS 10 → 0.86 after treatment (p = 0.017)
All patients showed improvement in muscle tightness and flexibility
Ultrasound revealed fascial thickening around the posterior thigh APF region
The affected region often involved proximity to the posterior femoral cutaneous nerve
No adverse effects or recurrence were observed during follow-up (mean 6.6 months)
Some patients required multiple treatment sessions for sustained improvement
These findings suggest that persistent post-injury pain may be linked more to fascial restriction than muscle tissue damage alone.
Proposed Mechanism
The authors introduce the concept of “perineural fascial pain”, where:
Pain originates from dysfunction in fascia surrounding nerves
Not due to direct nerve injury or classic myofascial trigger points
Fascial thickening may restrict nerve mobility or increase mechanical sensitivity
Restoring fascial glide reduces nociceptive input and improves function
This positions fascia as a potential driver of chronic post-injury pain syndromes.
Why It Matters for Fascia
This study highlights a clinically important shift in understanding sports injury recovery:
Fascia may be a primary source of persistent pain after muscle healing
Nerve–fascia interactions can contribute to chronic symptoms
Restoring fascial mobility may be more important than muscle-focused treatment alone
Ultrasound-guided interventions provide both diagnostic and therapeutic value
It strengthens the view that fascia is not just structural tissue, but an active participant in pain and recovery dynamics.
5 Takeaways
Persistent post-hamstring pain may originate from fascial dysfunction.
Ultrasound-guided hydrorelease significantly reduces pain and tightness.
Fascial thickening near nerves may contribute to symptoms.
Pain relief supports the concept of perineural fascial pain.
Fascia-targeted interventions may improve sports injury recovery outcomes.