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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Adam, Clayton
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Topics
Publications (13/13 displayed)
- 2020The effect of vertebral body stapling on spine biomechanics and structure using a bovine modelcitations
- 2014Gravity-induced coronal plane joint moments in the adolescent scoliotic spine
- 2014Segmental torso masses in adolescent idiopathic scoliosiscitations
- 2014The effect of repeated loading and freeze - thaw cycling on immature bovine thoracic motion segment stiffnesscitations
- 2014The effect of intervertebral staple insertion on bovine spine segment stiffness
- 2014Intervertebral staple grading system with micro-CT
- 2013Segmental torso masses and gravity-induced coronal plane joint moments in adolescent idiopathic scoliosis
- 2013The effect of testing protocol on immature bovine thoracic spine segment stiffness
- 2013Segmental torso masses and coronal plane joint torques in the adolescent scoliotic spine
- 2010Fusionless scoliosis correction using shape memory alloy staples
- 2009Development of a biaxial compression device for biological samples: preliminary experimental results for a closed cell foamcitations
- 2006Development of a method to validate computer models of the spine for scoliosis correction surgery simulation
- 2002Finite element analysis of high strain rate superplastic forming (SPF) of Al–Ti alloyscitations
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document
The effect of intervertebral staple insertion on bovine spine segment stiffness
Abstract
IntroductionThere is growing interest in the biomechanics of ‘fusionless’ implant constructs used for deformity correction in the thoracic spine. Intervertebral stapling is a leading method of fusionless corrective surgery. Although used for a number of years, there is limited evidence as to the effect these staples have on the stiffness of the functional spinal unit.Materials and MethodsThoracic spines from 6-8 week old calves were dissected and divided into motion segments including levels T4-T11 (n=14). Each segment was potted in polymethylemethacrylate. An Instron Biaxial materials testing machine with a custom made jig was used for testing. The segments were tested in flexion/extension, lateral bending and axial rotation at 37⁰C and 100% humidity, using moment control to a maximum 1.75 Nm with a loading rate of 0.3 Nm per second. This torque was found sufficient to achieve physiologically representative ranges of movement. The segments were initially tested uninstrumented with data collected from the tenth load cycle. Next a left anterolateral Shape Memory Alloy (SMA) staple was inserted (Medtronic Sofamor Danek, USA). Biomechanical testing was repeated as before with data collected from the tenth load cycle.ResultsIn flexion/extension there was an insignificant drop in stiffness of 3% (p=0.478). In lateral bending there was a significant drop in stiffness of 21% (p<0.001). This was mainly in lateral bending away from the staple, where the stiffness reduced by 30% (p<0.001). This was in contrast to lateral bending towards the staple where it dropped by 12% which was still statistically significant (p=0.036). In axial rotation there was an overall near significant drop in stiffness of 11% (p=0.076). However, this was more towards the side of the staple measuring a decrease of 14% as opposed to 8% away from the staple. In both cases it was a statistically insignificant drop (p=0.134 and p=0.352 respectively).ConclusionInsertion of intervertebral SMA staples results in a significant reduction in motion segment stiffness in lateral bending especially in the direction away from the staple. The staple had less effect on axial rotation stiffness and minimal effect on flexion/extension stiffness.