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Morphological parameters for implantation of the screwless spring loop dynamic posterior spinous process stabilizing
1Department of Biomedical Engineering, Graduate School, Catholic University of Daegu, Gyungbuk, South Korea.
Summary
This study analyzed lumbar spinous process morphology for screwless wire spring loop stability. Findings reveal gender and level-specific variations impacting fixation, crucial for implant development.
Area of Science:
- Spine surgery
- Orthopedic biomechanics
- Anatomical variations
Background:
- Screwless wire spring loops offer a minimally invasive approach for spinal fixation.
- Understanding the anatomical compatibility of the spinous process is critical for successful screwless implantations.
Purpose of the Study:
- To quantify the morphological characteristics of the posterior lumbar spinous process.
- To assess how these characteristics influence the stable implantation of screwless wire spring loops.
Main Methods:
- Computed tomography (CT)-derived three-dimensional vertebral models of 40 Korean subjects were used.
- Virtual implantations of screwless wire spring loops were performed.
- Morphological parameters and bone-implant interference were measured for lumbar vertebrae L1-L5.
Main Results:
- Transspinous fixation length in males decreased caudally (L1-L2 to L4-L5) and was shorter in females.
- Fixation angles varied with vertebral level.
- Spinous process thickness differed between genders and levels, impacting the ratio of thickness to fixation length.
Conclusions:
- Lumbar spinous process morphology, including thickness and fixation length, varies significantly by gender and vertebral level.
- These anatomical parameters are critical considerations for the design and implantation of screwless wire spring loops to ensure fixation stability.
