Injecting hyaluronan in the thoracolumbar fascia: A model study

Area of Science:

• Biomedical Engineering
• Musculoskeletal Research
• Rheumatology

Background:

• Hyaluronan (HA) is implicated in thoracolumbar fascia (TLF) densification, a factor in non-specific lower back pain (LBP).
• Current LBP treatments include manual therapy and anti-inflammatory drugs.
• Novel therapeutic strategies targeting fascial mechanics are needed.

Purpose of the Study:

• To develop an animal model for studying ultrasound-guided intrafascial injection of hyaluronan (HA).
• To evaluate the effects of low and high molecular weight (Mw) HA on TLF profibrotic markers and mechanical properties.
• To assess the lubricating and injectability characteristics of different HA preparations.

Main Methods:

• Establishment of a rabbit model for TLF extraction and intrafascial injection.
• Quantitative PCR (qPCR) to measure profibrotic gene expression.
• Rheology to assess TLF mechanical properties.
• Tribology to evaluate lubricating properties.
• Measurement of injection force and spreadability.

Main Results:

• Rabbits provide a suitable model for TLF intrafascial injection studies.
• Low Mw HA demonstrated superior lubricating properties compared to high Mw HA.
• Low Mw HA exhibited lower injection force and better inter-fascial spread.
• Neither low nor high Mw HA induced profibrotic effects in the TLF.

Conclusions:

• Intrafascial injection of low Mw HA is a promising approach to enhance fascial gliding.
• This method may offer a targeted treatment for myofascial lower back pain.
• The developed rabbit model facilitates further research into HA-based therapies for LBP.