Lower spinal mobility and external immobilization in the normal and pathologic condition

Area of Science:

• Orthopedic biomechanics
• Spinal imaging analysis
• Spinal fusion and bracing

Background:

• Spondylolisthesis often requires spinal immobilization to prevent further progression.
• Effective bracing is crucial for managing spinal instability and promoting healing.
• Assessing the efficacy of different orthotics in limiting lumbosacral motion is clinically significant.

Purpose of the Study:

• To evaluate the effectiveness of three orthotics in immobilizing the lumbosacral spine.
• To compare spinal motion in healthy individuals versus patients with spondylolisthesis.
• To determine if specific orthotics can significantly reduce lumbosacral motion.

Main Methods:

• Lateral flexion and extension roentgenograms were used to measure lumbosacral motion.
• Measurements were taken on healthy volunteers and patients with spondylolisthesis.
• Three orthotics were tested: lumbosacral corset, Jewett extension brace, and plastic thoracolumbosacral orthosis (TLSO).

Main Results:

• No significant difference in lower lumbar motion was observed between healthy individuals and spondylolisthesis patients.
• The lumbosacral corset failed to immobilize the L3-S1 spinal levels.
• The Jewett brace and TLSO significantly reduced motion at L3-4 and L4-5 (P < .01), but did not eliminate it.
• No tested orthotic could adequately immobilize the L5-S1 level, with some showing increased motion.

Conclusions:

• Current orthotics provide limited immobilization of the lumbosacral spine, particularly at the L5-S1 level.
• Further development of spinal bracing is needed for effective management of conditions like spondylolisthesis.
• Individual variations in spinal motion necessitate personalized bracing strategies.