Intra-observer reliability study of lumbar segmental measurements utilizing ultrasonography.

Area of Science:

• Biomechanical assessment
• Spinal kinematics
• Diagnostic imaging

Background:

• Spinal Manipulative Therapy (SMT) is beneficial for low back pain (LBP), but its precise mechanisms remain unclear.
• A leading hypothesis suggests SMT improves LBP by restoring interspinal motion.
• Ultrasound measurement (UM) offers a potential method to quantify spinous process separation (SPS) and assess intersegmental spinal movement.

Purpose of the Study:

• To evaluate the test-retest reliability of ultrasound measurement (UM) for assessing spinous process separation (SPS).
• To determine if UM can reliably measure changes in interspinous distances in the lumbar spine.

Main Methods:

• Fifteen asymptomatic volunteers underwent repeated UM of spinous processes (L3-S1) in a prone position.
• Measurements were taken before and after a 5-minute walking period.
• Intra-class correlation coefficient (ICC) was used to assess the reliability of UM for SPS.

Main Results:

• High ICC values indicated excellent test-retest reliability for SPS measurements: 0.982 (L3-L4), 0.992 (L4-L5), and 0.997 (L5-S1).
• Root mean square differences were small, ranging from 0.35mm to 0.57mm, demonstrating precision.

Conclusions:

• Ultrasound measurement (UM) is a reliable method for quantifying interspinous distance.
• This technique provides a dependable tool for future research into the biomechanical effects of SMT on spinal movement in LBP.