Spinal Cord Drift Following Laminoplasty Versus Laminectomy and Fusion for Cervical Spondylotic Myelopathy

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Figure 1
The midpoint of the spinal cord was determined by adding the anterior spinal cord space (A) to the half value of the AP spinal cord diameter (B/2). This value (A + (B/2)) was determined at each decompressed level and averaged to give a global representation of spinal cord position.
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Figure 2
Mean and maximal cervical drift measured via postoperative magnetic resonance imaging.
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Figure 3
Mean cervical drift per level measured via postoperative magnetic resonance imaging.
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Figure 4
Preoperative (A) and postoperative (B) T2-sagittal magnetic resonance imaging (MRI) in a 57-y-old female who underwent a C3–C7 LF. Preoperative (C) and postoperative (D) T2-sagittal MRI in a 49-y-old male who underwent a C3–C7 laminoplasty.