Multiaxial spine testing apparatus: system characterisation by evaluation of analogue and cadaveric lumbar spines

Dooley, Zachary A.; Turner, Alexander W.; Corwall, G. Bryan

doi:10.1504/ijecb.2013.056544

Cited by 7 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each specimen was tested on a custom 6 degrees-offreedom spine test system ( Figure 2) described previously, 16 using three cycles each of unconstrained 6.0 N·m moments in flexion-extension, left-right lateral bending, and left-right axial rotation. No axial load was applied.…”

Section: Experimental Protocolmentioning

confidence: 99%

Contribution of Round vs. Rectangular Expandable Cage Endcaps to Spinal Stability in a Cadaveric Corpectomy Model

et al. 2015

View full text Add to dashboard Cite

BackgroundExpandable cages are gaining popularity in anterior reconstruction of the thoracolumbar spine following corpectomy as they can provide adjustable distraction and deformity correction. Rectangular, rather than circular, endcaps provide increased resistance to subsidence by spanning the apophyseal ring; however their impact on construct stability is not known. The objective of this study was to investigate the contribution of expandable corpectomy cage endcap shape (round vs. rectangular) and fixation method (anterior plate vs. posterior pedicle screws) to the stability of an L1 sub-total corpectomy construct.

show abstract

Section: Experimental Protocolmentioning

confidence: 99%

Contribution of Round vs. Rectangular Expandable Cage Endcaps to Spinal Stability in a Cadaveric Corpectomy Model

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Specimens were subjected to nondestructive multidirectional testing using a Labviewcontrolled (National Instruments Corp.) custom-built 6 degrees-of-freedom spine testing system described previously. 5 Forces and moments were continuously measured by a 6 degrees-of-freedom load cell mounted at the cranial end of the specimen. The specimens were loaded with unconstrained pure moments of ± 7.5 N·m in the sagittal plane (flexion-extension), coronal plane (left-right lateral bending), and transverse plane (left-right axial rotation).…”

Section: Flexibility Testingmentioning

confidence: 99%

Biomechanics of lateral lumbar interbody fusion constructs with lateral and posterior plate fixation

Fogel¹,

Parikh

Ryu

et al. 2014

SPI

View full text Add to dashboard Cite

Object Lumbar interbody fusion is indicated in the treatment of degenerative conditions. Laterally inserted interbody cages significantly decrease range of motion (ROM) compared with other cages. Supplemental fixation options such as lateral plates or spinous process plates have been shown to provide stability and to reduce morbidity. The authors of the current study investigate the in vitro stability of the interbody cage with a combination of lateral and spinous process plate fixation and compare this method to the established bilateral pedicle screw fixation technique. Methods Ten L1–5 specimens were evaluated using multidirectional nondestructive moments (± 7.5 N·m), with a custom 6 degrees-of-freedom spine simulator. Intervertebral motions (ROM) were measured optoelectronically. Each spine was evaluated under the following conditions at the L3–4 level: intact; interbody cage alone (stand-alone); cage supplemented with lateral plate; cage supplemented with ipsilateral pedicle screws; cage supplemented with bilateral pedicle screws; cage supplemented with spinous process plate; and cage supplemented with a combination of lateral plate and spinous process plate. Intervertebral rotations were calculated, and ROM data were normalized to the intact ROM data. Results The stand-alone laterally inserted interbody cage significantly reduced ROM with respect to the intact state in flexion-extension (31.6% intact ROM, p < 0.001), lateral bending (32.5%, p < 0.001), and axial rotation (69.4%, p = 0.002). Compared with the stand-alone condition, addition of a lateral plate to the interbody cage did not significantly alter the ROM in flexion-extension (p = 0.904); however, it was significantly decreased in lateral bending and axial rotation (p < 0.001). The cage supplemented with a lateral plate was not statistically different from bilateral pedicle screws in lateral bending (p = 0.579). Supplemental fixation using a spinous process plate was not significantly different from bilateral pedicle screws in flexion-extension (p = 0.476). The combination of lateral plate and spinous process plate was not statistically different from the cage supplemented with bilateral pedicle screws in all the loading modes (p ≥ 0.365). Conclusions A combination of lateral and spinous process plate fixation to supplement a laterally inserted interbody cage helps achieve rigidity in all motion planes similar to that achieved with bilateral pedicle screws.

show abstract

“…Testing was performed on a custom-built 6 degrees-offreedom spine test system described previously. 20 Motions were applied to the cephalad end of the specimen via electromechanical rotary actuators. The caudal end was unconstrained, with a system of passive bearings and a vertically oriented force-controlled pneumatic actuator to support the specimen.…”

Section: Methodsmentioning

confidence: 99%

Controlled Motion with the XL-TDR Lateral-Approach Lumbar Total Disk Replacement: In Vitro Kinematic Investigation

Pimenta

Turner

Oliveira

et al. 2014

J Neurol Surg A Cent Eur Neurosurg

View full text Add to dashboard Cite

The kinematics of XL-TDR have demonstrated that the retention of the anterior ligament/annulus has a significant stabilizing effect, diminishing ROM to less than intact, with a more controlled motion (more natural NZ). Removing the anterior ligament/annulus illustrated its stabilizing role, with ROM and NZ increasing significantly. Future studies will investigate the potential benefit of controlled XL-TDR motion on facet kinematics that may have clinical implications related to limiting facet degeneration.

show abstract

Multiaxial spine testing apparatus: system characterisation by evaluation of analogue and cadaveric lumbar spines

Cited by 7 publications

References 21 publications

Contribution of Round vs. Rectangular Expandable Cage Endcaps to Spinal Stability in a Cadaveric Corpectomy Model

Contribution of Round vs. Rectangular Expandable Cage Endcaps to Spinal Stability in a Cadaveric Corpectomy Model

Biomechanics of lateral lumbar interbody fusion constructs with lateral and posterior plate fixation

Controlled Motion with the XL-TDR Lateral-Approach Lumbar Total Disk Replacement: In Vitro Kinematic Investigation

Contact Info

Product

Resources

About