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Biomechanical Analysis of a Newly Developed Shape Memory Alloy Hook in a Transforaminal Lumbar Interbody Fusion (TLIF) In Vitro Model
- Source :
- PLoS ONE, PLoS ONE, Vol 9, Iss 12, p e114326 (2014)
- Publication Year :
- 2014
- Publisher :
- Public Library of Science, 2014.
-
Abstract
- Objective The objective of this biomechanical study was to evaluate the stability provided by a newly developed shape memory alloy hook (SMAH) in a cadaveric transforaminal lumbar interbody fusion (TLIF) model. Methods Six human cadaveric spines (L1-S2) were tested in an in vitro flexibility experiment by applying pure moments of ±8 Nm in flexion/extension, left/right lateral bending, and left/right axial rotation. After intact testing, a TLIF was performed at L4-5. Each specimen was tested for the following constructs: unilateral SMAH (USMAH); bilateral SMAH (BSMAH); unilateral pedicle screws and rods (UPS); and bilateral pedicle screws and rods (BPS). The L3–L4, L4–L5, and L5-S1 range of motion (ROM) were recorded by a Motion Analysis System. Results Compared to the other constructs, the BPS provided the most stability. The UPS significantly reduced the ROM in extension/flexion and lateral bending; the BSMAH significantly reduced the ROM in extension/flexion, lateral bending, and axial rotation; and the USMAH significantly reduced the ROM in flexion and left lateral bending compared with the intact spine (p0.05). Stability provided by the USMAH compared with the UPS was not significantly different. ROMs of adjacent segments increased in all fixed constructs (p>0.05). Conclusions Bilateral SMAH fixation can achieve immediate stability after L4–5 TLIF in vitro. Further studies are required to determine whether the SMAH can achieve fusion in vivo and alleviate adjacent segment degeneration.
- Subjects :
- musculoskeletal diseases
Manipulation, Spinal
medicine.medical_specialty
Microsurgery
Hook
Computer science
medicine.medical_treatment
Posture
Orthopedic Surgery
lcsh:Medicine
Surgical and Invasive Medical Procedures
Lumbar vertebrae
Biomechanical Phenomena
Musculoskeletal System Procedures
Cadaver
Lumbar interbody fusion
Pedicle Screws
medicine
Medicine and Health Sciences
Alloys
Humans
Biomechanics
Range of Motion, Articular
lcsh:Science
Pliability
Musculoskeletal System
Orthodontics
Multidisciplinary
Lumbar Vertebrae
lcsh:R
Lumbosacral Region
Biology and Life Sciences
Shape-memory alloy
musculoskeletal system
Spine
Surgery
medicine.anatomical_structure
Spinal Fusion
Spinal fusion
lcsh:Q
Anatomy
Cadaveric spasm
Research Article
Subjects
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 9
- Issue :
- 12
- Database :
- OpenAIRE
- Journal :
- PLoS ONE
- Accession number :
- edsair.doi.dedup.....5689eb9d7e5732ac2659d16e2b471609