Differences in repositioning error among patients with low back pain compared with control subjects

Area of Science:

• Biomedical Engineering
• Rehabilitation Science
• Kinesiology

Background:

• Low back pain rehabilitation often includes proprioceptive training, yet research on low back proprioception is limited.
• Proprioception, the sense of body position, is crucial for motor control and may be affected in low back pain.

Purpose of the Study:

• To quantify trunk repositioning error as a measure of low back proprioception.
• To compare trunk repositioning error between individuals with chronic low back pain and healthy controls.

Main Methods:

• Trunk repositioning error was assessed in 20 patients with low back pain and 20 controls.
• Subjects stood with immobilized legs and pelvis, moved to a target trunk position, and attempted to replicate it.
• Trunk position was measured using a 3Space Tracker, calculating error in frontal and sagittal planes.

Main Results:

• Patients with low back pain exhibited significantly higher repositioning error in trunk flexion compared to controls.
• Conversely, patients with low back pain showed significantly lower repositioning error in trunk extension than controls.

Conclusions:

• Increased trunk repositioning error in flexion suggests impaired proprioception in individuals with low back pain.
• The reduced error in extension may be linked to increased mechanoreceptor activation in facet joints, warranting further investigation.