[Correlation between pelvic indices, pelvic spatial orientation and lumbar vertebrate instability]

Area of Science:

• Spine biomechanics
• Radiographic analysis
• Orthopedic surgery

Context:

• Lumbar disc protrusion affects spinal stability.
• Pelvic parameters like pelvic incidence (PI), lumber lordosis (LL), pelvic tilt (PT), and sacrum slope (SS) are crucial for spinal alignment.
• Understanding the correlation between pelvic indices and lumbar spine stability is vital for surgical planning and patient outcomes.

Purpose:

• To investigate the relationship between lumbar vertebral stability and key pelvic parameters: PI, LL, PT, and SS.
• To compare these parameters between stable and unstable lumbar spine groups in patients with lumbar disc protrusion.

Summary:

• Retrospective analysis of 78 patients with lumbar disc protrusion.
• No significant inter-group differences were found in PI, LL, or PT overall.
• Higher sacrum slope (SS) was associated with instability in the L4/5 segment, and higher pelvic tilt (PT) with instability in the L5/S1 segment.

Impact:

• Sacrum slope and pelvic tilt may serve as potential indicators for lumbar instability at specific spinal levels (L4/5 and L5/S1).
• These findings can inform clinical assessments and treatment strategies for lumbar disc protrusion.
• Highlights the importance of detailed segmental analysis beyond overall pelvic parameters.