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The reciprocal relationship between thoracic and spinal deformity and its effect on pulmonary function in a rabbit
Hemal P Mehta1, Brian D Snyder, Natasha N Callender
1Orthopedic Biomechanics Laboratory, Beth Israel Deaconess Medical Center, Boston, MA 02115, USA.
Spine
|November 2, 2006
Summary
Spinal and thoracic deformities in rabbits caused scoliosis and asymmetric lung volumes. Unilateral growth disturbances led to greater spinal and thoracic cage distortion, impacting lung asymmetry.
Area of Science:
- Developmental biology
- Orthopedics
- Thoracic surgery
Background:
- Congenital scoliosis can lead to thoracic insufficiency.
- The relationship between spinal and thoracic growth is not fully understood.
- Understanding this association may explain thoracic insufficiency in congenital scoliosis patients.
Purpose of the Study:
- To investigate the direct relationship between spinal and thoracic growth.
- To examine spine and thorax growth under symmetric and asymmetric growth disturbances.
Main Methods:
- Growth disturbances were induced in 5-week-old rabbits.
- Serial CT scans assessed structural changes in the spine, thorax, and lung volume.
- Pulmonary function, spine, and thoracic deformity measures were analyzed.
Main Results:
- The unilateral tethered rib group showed significantly greater Cobb angle and thoracic cage distortion.
- No significant differences in total lung volume were observed among groups.
- A significant difference in the left/right lung volume ratio was found in the unilateral tethered rib group.
Conclusions:
- Unilateral spinal or thoracic deformity results in scoliosis and thoracic cage deformity.
- Asymmetric lung volumes are a consequence of unilateral deformities.
- This study provides insights into the development of thoracic insufficiency.