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Axial Compression Frame for MRI of Thoracolumbar Spine

Daniel S. J. Choy1, Gian Paolo Tassi2 and Richard B. Libes1

1 Laser Spine Center and Columbia University, 66 E 80th St., Suite 1A, New York, NY 10021.
2 Casa di Cura Villa Anna, San Benedetto del Tronto, Pescara, Italy.


Figure 1
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  		Fig. 1 —MR image in patient having symptoms compatible with L5–S1 disk herniation shows slight bulge (arrow) of L5–S1 disk. (Reprinted with permission from Choy DSJ. Percutaneous laser disc decompression: a practical guide. New York, NY: Springer-Verlag, 2003:126–127 [5])

 

Figure 2
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  		Fig. 2 —MR image of patient in Figure 1 obtained 5 minutes later. Note increased protrusion of disk (arrow). (Reprinted with permission from Choy DSJ. Percutaneous laser disc decompression: a practical guide. New York, NY: Springer-Verlag, 2003:126–127 [5])

 

Figure 3
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  		Fig. 3 —Sitting MRI scanner (Flexview 8800, GE Healthcare) with which image in Figure 2 was produced. (Reprinted with permission from Choy DSJ. Percutaneous laser disc decompression: a practical guide. New York, NY: Springer-Verlag, 2003:126–127 [5])

 

Figure 4
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  		Fig. 4 —First axial compression frame built of hard marine-grade plywood, with shoulder restraints and a movable footboard with hardwood dowel fixation. (Reprinted with permission from Choy DSJ. Percutaneous laser disc decompression: a practical guide. New York, NY: Springer-Verlag, 2003:126–127 [5])

 

Figure 5
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  		Fig. 5A —Compression Frame for MRI of Thoraco-Lumbar Spine (Steven Weiburg, Inc.). Pressure gauge is calibrated in kPa of disk pressure.

 

Figure 6
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  		Fig. 5B —Compression Frame for MRI of Thoraco-Lumbar Spine (Steven Weiburg, Inc.). Overall view of compression frame with vest connected to footplate to evenly distribute pressure.

 

Figure 7
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  		Fig. 6 —Graph shows composite curves for observed means of intradiskal pressure (kPa) and corresponding footplate pressure (kg). In lumbar disk, 150 kPa corresponds to 189 lb (85.91 kg) of foot pressure. Black line = raw means, short dashed line = quadratic model, long dashed line = log model.

 

Figure 8
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  		Fig. 7A —Representative MRI of lumbosacral spine. Sagittal T2 images obtained with wood frame. A was obtained without compression and B was obtained with compression. Marks indicate disk bulges.

 

Figure 9
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  		Fig. 7B —Representative MRI of lumbosacral spine. Sagittal T2 images obtained with wood frame. A was obtained without compression and B was obtained with compression. Marks indicate disk bulges.

 

Figure 10
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  		Fig. 8A —Representative MRI of lumbosacral spine. Sagittal images obtained with aluminum frame. A was obtained without compression and B was obtained with compression. Marks indicate disk bulges.

 

Figure 11
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  		Fig. 8B —Representative MRI of lumbosacral spine. Sagittal images obtained with aluminum frame. A was obtained without compression and B was obtained with compression. Marks indicate disk bulges.

 

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