Open versus endoscopic lumbar pedicle screw fixation and posterolateral fusion in a sheep model: a feasibility study

Jahng, Tae-Ahn; Fu, Tsai Sheng; Kim, Daniel H.

doi:10.1016/j.spinee.2004.02.009

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…In contrast, Krag et al [16] and Zindrick et al [42] believe that insertion of the pedicle along the medial trajectory is a safer technique. Jahng et al [43] reported in their experiments on sheep lumbar spine that there is a noticeable difference between the TPA and PAA, which is consistent with the current results. The difference between the TPA and PAA is most likely due to the different vertebral types (type I or II).…”

Section: Discussionsupporting

confidence: 93%

Morphometrical dimensions of the sheep thoracolumbar vertebrae as seen on digitised CT images

et al. 2013

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The sheep spine is widely used as a model for preclinical research in human medicine to test new spinal implants and surgical procedures. Therefore, precise morphometric data are needed. The present study aimed to provide computed tomographic (CT) morphometry of sheep thoracolumbar spine. Five adult normal Merino sheep were included in this study. Sheep were anaesthetised and positioned in sternal recumbency. Subsequently, transverse and sagittal images were obtained using a multi-detector-row helical CT scanner. Measurements of the vertebral bodies, pedicles, intervertebral disc and transverse processes were performed with dedicated software. Vertebral bodies and the spinal canal were wider than they were deep, most obviously in the lumbar vertebrae. The intervertebral discs were as much as 57.4% thicker in the lumbar than in the thoracic spine. The pedicles were higher and longer than they were wide over the entire thoracolumbar spine. In conclusion, the generated data can serve as a CT reference for the ovine thoracolumbar spine and may be helpful in using sheep spine as a model for human spinal research.

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Section: Discussionsupporting

confidence: 93%

Morphometrical dimensions of the sheep thoracolumbar vertebrae as seen on digitised CT images

et al. 2013

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“…Sheep have become a practical model for spine surgery research [11]. In general, sheep have 7 cervical, 12-14 thoracic, and 6-7 lumbar vertebrae.…”

Section: Discussionmentioning

confidence: 99%

A-Mode ultrasound guidance for pedicle screw advancement in ovine vertebral bodies

et al. 2010

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The increase in the BUB amplitudes in the distal insertion pathway suggests that, at least with a 2.5-MHz transducer, an approximate 1.5-cm US window exists in most cases, by which close approach of the ventral marrow-cortex interface could be anticipated. Other ratios may serve as stop criteria to prevent further drilling. A precipitous drop in BUB amplitude may be an indication of a cortex perforation.

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“…We therefore performed this study in sheep to close this gap. An ovine model was used since the available experience [13,23] from the routine screw interventions does not have any effect, due to the differing anatomy and marked soft tissue layer in sheep. The pedicle/screw diameter relation of the sheep is generally smaller than in humans [13,23].…”

Section: Discussionmentioning

confidence: 99%

“…Currently, there are only a few clinical studies, which describe the percutaneous placement of pedicle screws [8,13,21,24,34]. Despite the misplacement rate of 6.6 and 12.5% reported, it should be kept in mind that the surgical procedure is technically demanding and should be performed only by experienced spine surgeons [21,34].…”

Section: Discussionmentioning

confidence: 99%

Comparison of open versus percutaneous pedicle screw insertion in a sheep model

et al. 2008

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Minimally invasive surgery has become more and more important for the treatment of traumatic spine fractures. Besides, some clinical studies, objective data regarding the possible lower damage to the surrounding tissue of the spine is still missing. Here we report a sheep model where we compared a percutaneous versus an open approach for dorsal instrumentation with pedicle screws to the spine. Twelve skeletally mature sheep underwent bilateral pedicle screw fixation at the L4-L6 level. Fortyeight pedicle screws were bilaterally inserted into the pedicles and connected with rods using either an open dorsal standard or a percutaneous approach. Operation time, blood flow, compartment pressure, radiation time, loss of blood, laboratory findings and EMG were evaluated to objectify possible advantages for the percutaneous operation technique. Loss of blood and the distribution of CK-MM as a marker for muscle damage were significantly lower in the percutaneous group. However, radiation time was significantly longer in the percutaneous group. Other parameters like compartment pressure, blood flow and also measurement of the EMG at different time points did not reveal significant differences. Based on the results we found in the present study, percutaneous screw insertion can bring moderate advantages but it should be noted that essential functional deficits to the muscle could not be detected.

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Open versus endoscopic lumbar pedicle screw fixation and posterolateral fusion in a sheep model: a feasibility study

Cited by 10 publications

References 23 publications

Morphometrical dimensions of the sheep thoracolumbar vertebrae as seen on digitised CT images

Morphometrical dimensions of the sheep thoracolumbar vertebrae as seen on digitised CT images

A-Mode ultrasound guidance for pedicle screw advancement in ovine vertebral bodies

Comparison of open versus percutaneous pedicle screw insertion in a sheep model

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