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ASKyphoplan: a program for deformity planning in ankylosing spondylitis.

van Royen BJ, Scheerder FJ, Jansen E, Smit TH - Eur Spine J (2007)

Bottom Line: Adequate deformity planning is essential for reliable prediction of the effect of surgical correction of the spine on the sagittal balance and horizontal gaze of the patient.However, this mathematical equation is not easily used in daily practice.The steps taken during an ASKyphoplan run are outlined, and the clinical application is discussed.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedic Surgery, VU University Medical Center, P.O. Box 7057, 1007, MB Amsterdam, The Netherlands. bj.vanroyen@vumc.nl

ABSTRACT
A closing wedge osteotomy of the lumbar spine may be considered to correct posture and spinal balance in progressive thoracolumbar kyphotic deformity caused by ankylosing spondylitis (AS). Adequate deformity planning is essential for reliable prediction of the effect of surgical correction of the spine on the sagittal balance and horizontal gaze of the patient. The effect of a spinal osteotomy on the horizontal gaze is equal to the osteotomy angle. However, the effect of a spinal osteotomy on the sagittal balance depends on both the correction angle and the level of osteotomy simultaneously. The relation between the correction angle, the level of osteotomy and the sagittal balance of the spine can be expressed by a mathematical equation. However, this mathematical equation is not easily used in daily practice. We present the computer program ASKyphoplan that analyses and visualizes the planning procedure for sagittal plane corrective osteotomies of the spine in AS. The relationship between the planned correction angle, level of osteotomy and sagittal balance are coupled into the program. The steps taken during an ASKyphoplan run are outlined, and the clinical application is discussed. The application of the program is illustrated by the analysis of the data from a patient recently treated by a lumbar osteotomy in AS. The software can be used free of charge on the internet at http://www.stega.nl under the heading "research" in the menu.

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Related in: MedlinePlus

ASKyphoplan report
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Related In: Results  -  Collection


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Fig3: ASKyphoplan report

Mentions: The relation between the correction angle, the level of osteotomy and the sagittal balance of the spine is calculated and visualized in the computer program. By planning the osteotomy at level L4 and aiming the post-operative SVA at 75 mm for example [6], the aimed correction angle at L4 and resulting correction of the CBVA follows. Using the ‘visibility’ bar, the virtual post-operative radiograph can be visualized (Fig. 3). The effect of changing the level of osteotomy on the SVA and CBVA correction or the effect of changing the correction angle on the SVA and CBVA can be visualized clearly by changing these variables in the program.


ASKyphoplan: a program for deformity planning in ankylosing spondylitis.

van Royen BJ, Scheerder FJ, Jansen E, Smit TH - Eur Spine J (2007)

ASKyphoplan report
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2200734&req=5

Fig3: ASKyphoplan report
Mentions: The relation between the correction angle, the level of osteotomy and the sagittal balance of the spine is calculated and visualized in the computer program. By planning the osteotomy at level L4 and aiming the post-operative SVA at 75 mm for example [6], the aimed correction angle at L4 and resulting correction of the CBVA follows. Using the ‘visibility’ bar, the virtual post-operative radiograph can be visualized (Fig. 3). The effect of changing the level of osteotomy on the SVA and CBVA correction or the effect of changing the correction angle on the SVA and CBVA can be visualized clearly by changing these variables in the program.

Bottom Line: Adequate deformity planning is essential for reliable prediction of the effect of surgical correction of the spine on the sagittal balance and horizontal gaze of the patient.However, this mathematical equation is not easily used in daily practice.The steps taken during an ASKyphoplan run are outlined, and the clinical application is discussed.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedic Surgery, VU University Medical Center, P.O. Box 7057, 1007, MB Amsterdam, The Netherlands. bj.vanroyen@vumc.nl

ABSTRACT
A closing wedge osteotomy of the lumbar spine may be considered to correct posture and spinal balance in progressive thoracolumbar kyphotic deformity caused by ankylosing spondylitis (AS). Adequate deformity planning is essential for reliable prediction of the effect of surgical correction of the spine on the sagittal balance and horizontal gaze of the patient. The effect of a spinal osteotomy on the horizontal gaze is equal to the osteotomy angle. However, the effect of a spinal osteotomy on the sagittal balance depends on both the correction angle and the level of osteotomy simultaneously. The relation between the correction angle, the level of osteotomy and the sagittal balance of the spine can be expressed by a mathematical equation. However, this mathematical equation is not easily used in daily practice. We present the computer program ASKyphoplan that analyses and visualizes the planning procedure for sagittal plane corrective osteotomies of the spine in AS. The relationship between the planned correction angle, level of osteotomy and sagittal balance are coupled into the program. The steps taken during an ASKyphoplan run are outlined, and the clinical application is discussed. The application of the program is illustrated by the analysis of the data from a patient recently treated by a lumbar osteotomy in AS. The software can be used free of charge on the internet at http://www.stega.nl under the heading "research" in the menu.

Show MeSH
Related in: MedlinePlus