Relationship between Spinal Cord Volume and XXXX due to Spinal Shortening.

@entity1566 @entity1347 @entity66912 @entity1237
UNASSIGNED: Vertebral column resection is associated with a risk of @entity1566 . In the present study, using a @entity1237 model, we aimed to investigate the relationship between changes in spinal cord volume and @entity1566 due to spinal shortening, and to quantify the spinal cord volume @entity66912 -mm height in order to clarify a safe limit for shortening. Vertebral column resection was performed at T10 in 10 @entity1237 . The spinal cord was shortened until the somatosensory-evoked potential was decreased by 50% from the baseline amplitude or delayed by 10% relative to the baseline peak latency. A wake-up test was performed, and the @entity1237 were observed for two days postoperatively. Magnetic resonance imaging was used to measure the spinal cord volume, T10 height, disc height, @entity1347 , and spinal segment height pre- and postoperatively. Two of the 10 @entity1237 were excluded, and hence, only data from eight @entity1237 were analyzed. The somatosensory-evoked potential of these eight @entity1237 demonstrated meaningful changes. With regard to neurologic function, five and three @entity1237 were classified as Tarlov grades 5 and 4 at two days postoperatively. The mean shortening distance was 23.6    1.51 mm, which correlated with the d-value (post-pre) of the spinal cord volume @entity66912 -mm height of the osteotomy segment (r = 0.95, p < 0.001) and with the height of the T10 body (r = 0.79, p = 0.02). The mean d-value (post-pre) of the spinal cord volume @entity66912 -mm height of the osteotomy segment was 142.87    0.59 mm3 (range, 142.19-143.67 mm3). The limit for shortening was approximately 106% of the vertebral height. The mean volumes of the osteotomy and spinal segments did not significantly change after surgery (t = 0.310, p = 0.765 and t = 1.241, p = 0.255, respectively). Thus, our results indicate that the safe limit for shortening can be calculated using the change in spinal cord volume @entity66912 -mm height.
