Related Experiment Video
Updated: May 28, 2026
08:36
Lateral-PLIF for Lumbar Spinal Arthrodesis: A Detailed Step-By-Step Surgical Technique
Published on: January 23, 2026
Lumbar lordosis and pars interarticularis fractures: a case-control study
William G Bugg1, Mark Lewis, Arne Juette
1Norwich Radiology Academy, Cotman Centre, Colney Lane, Norwich, Norfolk, NR4 7UB, United Kingdom. william.bugg@nnuh.nhs.uk
Skeletal Radiology
|October 19, 2011
Summary
Increased lumbar lordosis and sacral tilt are linked to pars interarticularis fractures. This suggests a potential biomechanical predisposition to spondylolysis in individuals with these spinal characteristics.
Area of Science:
- Orthopedics
- Radiology
- Biomechanics
Background:
- Pars interarticularis fractures, a common cause of low back pain in adolescents and young adults, are often associated with spondylolisthesis.
- Lumbar lordosis and pelvic tilt are key biomechanical parameters of the lumbosacral spine that may influence stress on the pars interarticularis.
Purpose of the Study:
- To investigate the association between the degree of lumbar lordosis and the occurrence of bilateral L5 pars interarticularis fractures.
- To evaluate the role of sacral tilt as a potential predisposing factor in the development of pars interarticularis defects.
Main Methods:
- A retrospective case-control study comparing lumbar lordosis and S1 endplate angle (sacral tilt) in patients with bilateral L5 pars interarticularis fractures versus age- and sex-matched controls.
- Measurements were performed on standing lateral lumbar spine radiographs and MRI examinations.
Main Results:
- Patients with bilateral L5 pars interarticularis fractures exhibited a significantly greater mean angle of lordosis (36.9°) compared to controls (30.1°).
- A significantly increased mean angle of sacral tilt was observed in the fracture group (136.4°) versus the control group (122.2°).
Conclusions:
- Steeply angled sacral endplates (increased sacral tilt) are associated with increased lumbar lordosis between L4 and S1.
- These biomechanical factors, particularly steep sacral angulation, may predispose individuals to pars interarticularis impingement and subsequent spondylolysis.
