Analgesic Effects of Two Types of Spinal Manipulation in Acute Lumbar Radiculopathy Model Rats

Area of Science:

• Neuroscience
• Biomedical Engineering
• Pain Management

Background:

• Acute lumbar radiculopathy (ALR) is a debilitating condition often treated with conservative methods.
• Spinal manipulation (SM) is a therapeutic approach used for various musculoskeletal conditions.
• Understanding the efficacy and mechanisms of different SM techniques is crucial for optimizing treatment strategies.

Purpose of the Study:

• To compare the analgesic effects of two spinal manipulation (SM) techniques: mobilization (MOB) and manipulation (MAN).
• To investigate the therapeutic mechanisms, specifically the role of nitric oxide synthase (NOS), in an acute lumbar radiculopathy (ALR) rat model.
• To evaluate the effectiveness of SM compared to sham manipulation (SMA) in relieving pain.

Main Methods:

• An ALR rat model was established using autologous nucleus pulposus (ANP) transplantation.
• Rats were divided into six groups: blank, sham operation, model, SMA, MOB, and MAN.
• Behavioral pain tests (50% PWT and PWL) and immunohistochemical analysis of NOS expression were performed.

Main Results:

• Both MAN and MOB groups showed significant pain reduction compared to the SMA group.
• The MOB group exhibited a more pronounced analgesic effect in the early stages (days 1-4) compared to the MAN group.
• Both MAN and MOB groups demonstrated reduced NOS expression on day 12, suggesting a role in pain relief.

Conclusions:

• Spinal manipulation (SM) and mobilization are effective in alleviating pain associated with ALR in rats.
• These techniques may exert their analgesic effects by reducing neuroinflammation, possibly through the inhibition of nitric oxide synthase (NOS) overexpression.
• Mobilization showed a quicker onset of pain relief compared to manipulation, although both were beneficial.