The Variability of Lumbar Sequential Motion Patterns: Observational Study

Area of Science:

• Biomechanics
• Spinal Kinematics
• Musculoskeletal Health

Background:

• Abnormal lumbar spine motion is linked to spinal complaints.
• Previous research described lumbar spine ranges of motion but lacked detailed segmental patterns.
• A clear definition of physiological lumbar motion is still needed.

Purpose of the Study:

• To define the physiological motion pattern of the lumbar spine.
• To determine the sequence of segmental contributions in sagittal rotation during flexion and extension.
• To analyze motion in healthy young male participants.

Main Methods:

• Cinematographic recordings of 11 healthy males (aged 18-25) were analyzed.
• Image recognition software identified segmental rotation patterns (L1-S1).
• Intraindividual variability and inter-rater reliability were assessed.

Main Results:

• No consistent segmental motion pattern was found during lumbar spine flexion.
• A consistent pattern was observed in the upper lumbar spine during the final phase of extension (L3L4, L2L3, L1L2 peaks).
• This extension pattern occurred in 71% of recordings and was consistent in 64% of participants.

Conclusions:

• A consistent upper lumbar motion pattern during extension was identified in a majority of asymptomatic young males.
• Physiological lumbar spine motion is a complex concept influenced by multiple factors.
• A definitive, firm definition of physiological lumbar motion is not yet established.