Validation of a novel spinal posture monitor: Comparison with digital videofluoroscopy

Purpose: A novel, minimally invasive posture monitor which can monitor lumbar postures outside the laboratory has demonstrated excellent reliability, as well as concurrent validity compared to a surface marker-based motion analysis system. However, it is unclear if this device reflects underlying vertebral motion. Methods: Twelve participants performed full range sagittal plane lumbo-pelvic movements during sitting and standing. Their posture was measured simultaneously using both this device (BodyGuard™) and digital videofluoroscopy. Results: Strong correlations were observed between the two methods (all r _s > 0.88). Similarly, the coefficients of determination were high (all r ² > 0.78). The maximum mean difference between the measures was located in the mid-range of motion and was approximately 3.4 in sitting and 3.9 in standing. Conclusion: The BodyGuard™ appears to be a valid method for analysing vertebral motion in the sagittal plane and is a promising tool for long-term monitoring of spinal postures in laboratory and clinical settings in people with low back pain.