New insights into spinopelvic-hip motion age-related changes in postural adaptability

Area of Science:

• Orthopedics
• Biomedical Engineering
• Gerontology

Background:

• Age-related changes in spinal, pelvic, and hip alignment are critical for orthopedic care in older adults.
• Limited population data exists on age- and sex-related spinal-pelvic-hip motion during postural transitions.
• Understanding these changes is essential for optimizing management strategies.

Purpose of the Study:

• To investigate age- and sex-related differences in spinal-pelvic-hip motion.
• To analyze changes in alignment parameters between standing and sitting postures.
• To establish reference data for community-dwelling populations.

Main Methods:

• Cross-sectional study of 1148 community-dwelling adults in Japan.
• Acquisition of full-spine lateral radiographs in standing and sitting postures.
• Measurement of lumbar lordosis, pelvic tilt, pelvic-femoral angle, and sacral slope, analyzing posture-related changes and age/sex differences.

Main Results:

• Significant changes in all alignment parameters between standing and sitting (P < 0.001).
• Age-related decline in posture-related lumbar lordosis, pelvic tilt, and sacral slope (P < 0.001).
• Increased pelvic rigidity with age; women showed greater lumbar lordosis and pelvic tilt than men, with comparable posture-related changes.

Conclusions:

• Spinal and pelvic flexibility decreases with age, with increased reliance on hip flexion.
• Findings provide population-based reference data for spinal-pelvic-hip biomechanics.
• Supports the need for age-specific assessment of postural adaptability in clinical practice.