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Spinal ligament loading during axial distraction: a biomechanical model
C S Roberts1, M J Voor, S M Rose
1Department of Orthopaedic Surgery, University of Louisville School of Medicine, Kentucky, USA.
American Journal of Orthopedics (Belle Mead, N.J.)
|July 4, 1998
Summary
This study measured lumbar spine ligament forces during distraction. The posterolateral complex bore the most load (45.3%), followed by the anterior longitudinal ligament (37.5%) and posterior longitudinal ligament (17.2%).
Area of Science:
- Biomechanics
- Spinal Surgery
- Orthopedics
Background:
- Understanding the load distribution among lumbar spine ligaments is crucial for surgical planning and injury management.
- Previous methods for measuring ligament forces in situ have limitations.
Purpose of the Study:
- To develop and validate a method for quantifying individual spinal ligament forces during axial distraction.
- To determine the load-bearing contributions of the anterior longitudinal ligament (ALL), posterior longitudinal ligament (PLL), and posterolateral complex (PLC) in the lumbar spine.
Main Methods:
- Utilized an in vitro corpectomy model of the lumbar spine.
- Employed a sequential ligament-cutting technique combined with an arthroscopically implantable force probe (AIFP).
- Measured ligament forces during controlled axial spinal distraction.
Main Results:
- The posterolateral complex (PLC) sustained the highest percentage of the total axial load (45.3%).
- The anterior longitudinal ligament (ALL) carried 37.5% of the axial load.
- The posterior longitudinal ligament (PLL) bore 17.2% of the axial load.
Conclusions:
- The PLC is the primary load-bearing structure during axial distraction in this lumbar spine model.
- The ALL and PLL contribute significantly to load resistance, but to a lesser extent than the PLC.
- This measurement technique provides valuable insights into spinal stability and ligament function.