Shock absorbing function study on denucleated intervertebral disc with or without hydrogel injection through static...

Area of Science:

• Biomedical Engineering
• Orthopedics
• Regenerative Medicine

Background:

• Degenerative disc disease is a common condition affecting spinal function.
• Hydrogel injection is a potential therapy to restore disc height and motion.
• The impact of hydrogel injection on the shock-absorbing capacity of intervertebral discs remains unclear.

Purpose of the Study:

• To evaluate the shock-absorbing properties of intervertebral discs after hydrogel injection.
• To compare the biomechanical function of hydrogel-treated discs with normal and discectomy-only controls.

Main Methods:

• 18 porcine lumbar bone-disc-bone specimens were used.
• Specimens were divided into three groups: normal, hydrogel-injected (mimic), and discectomy-only (control).
• Static compression tests and dynamic frequency sweeps were performed to assess biomechanical properties.

Main Results:

• Hydrogel-injected discs showed similar static displacement to normal discs, unlike control discs.
• Storage modulus, loss modulus, and tanδ generally increased with frequency for all groups.
• Control discs exhibited the highest biomechanical parameters, while normal discs had the lowest; hydrogel-injected discs were closer to normal.

Conclusions:

• Hydrogel injection effectively restores the shock-absorbing function of treated intervertebral discs.
• This technique shows potential for maintaining the biomechanical integrity of degenerative discs.
• Hydrogel injection is a promising therapeutic approach for degenerative disc disease.