Enhancing spinal bone anchor pull-out resistance with an L-shaped anchor.
PLoS One
; 19(5): e0302996, 2024.
Article
in En
| MEDLINE
| ID: mdl-38718026
ABSTRACT
The success rate of spinal fusion surgery is mainly determined by the fixation strength of the spinal bone anchors. This study explores the use of an L-shaped spinal bone anchor that is intended to establish a macro-shape lock with the posterior cortical layer of the vertebral body, thereby increasing the pull-out resistance of the anchor. The performance of this L-shaped anchor was evaluated in lumbar vertebra phantoms (L1-L5) across four distinct perpendicular orientations (lateral, medial, superior, and inferior). During the pull-out experiments, the pull-out force, and the displacement of the anchor with respect to the vertebra was measured which allowed the determination of the maximal pull-out force (mean 123 N ± 25 N) and the initial pull-out force, the initial force required to start motion of the anchor (mean 23 N ± 16 N). Notably, the maximum pull-out force was observed when the anchor engaged the cortical bone layer. The results demonstrate the potential benefits of utilising a spinal bone anchor featuring a macro-shape lock with the cortical bone layer to increase the pull-out force. Combining the macro shape-lock fixation method with the conventional pedicle screw shows the potential to significantly enhance the fixation strength of spinal bone anchors.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Spinal Fusion
/
Lumbar Vertebrae
Limits:
Humans
Language:
En
Journal:
PLoS One
Journal subject:
CIENCIA
/
MEDICINA
Year:
2024
Type:
Article
Affiliation country:
Netherlands