Effects of modified U-shaped interspinous distraction device on cadaveric intervertebral disc pressure

Authors

  • Chindanai Hongsaprabhas Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
  • Pibul Itiravivong Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
  • Pairat Tangpornprasert Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand
  • Chanyaphan Virulsi Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand

Keywords:

Interspinous, distraction device, modified U-shape device, tension wire loop, intervertebral disc pressure, biomechanical cadaveric study

Abstract

Background: Adjacent syndrome is a widely concerned adverse outcome after spinal fusion. Interspinous distraction device (IDD) has become an interesting device and seems to be the solution by theoretically controlling loads to adjacent levels.

Objective: To analyze the effects of a modified U-shape IDD on the intervertebral disc (IVD) pressure at instrumented and adjacent level of a lumbar spine model.

Methods: Three cadaveric specimens using lumbar vertebrae level 1 - 5 (L1 - L5) spines were loaded in neutral, flexion and extension. Needle pressure sensor was applied to measure IVD pressure at anterior annulus, nucleus pulposus, and posterior annulus of the IVD at L2 - L3, L3 - L4, and L4 - L5. Cadaveric specimens were tested in 4 consecutive sequences including intact specimen, bilateral facetectomy at L3 - L4, insertion of the modified U-shape IDD at L3 - L4, and pedicle screw fixation at L3 - L4, respectively.

Results: By using the modified U-shape IDD, the IVD pressures at L2 – L3 were decreased when compared to both destabilized specimen and specimen with pedicle screw fixation especially IVD pressure at nucleus pulposus in flexion position of cadaveric specimen (P = 0.021). However, the IVD pressures at L3 – L4 and L4 – L5 were randomly affected by this device.

Conclusions: The modified U-shape IDD provides support for the upper adjacent IVD pressures but the effect for the instrumented and lower adjacent level are still unremarkable.

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Singhatanadgige W, Tangpornprasert P, Wangroongsub Y, Itiravivong P, Limpaphayom N. A biomechanical cadaveric study of a modified U-shaped interspinous distraction device. J Spinal Disord Tech 2014;27:290-6. https://doi.org/10.1097/BSD.0000000000000049

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Published

2023-07-19

How to Cite

1.
Hongsaprabhas C, Itiravivong P, Tangpornprasert P, Virulsi C. Effects of modified U-shaped interspinous distraction device on cadaveric intervertebral disc pressure. Chula Med J [Internet]. 2023 Jul. 19 [cited 2024 May 20];65(2). Available from: https://he05.tci-thaijo.org/index.php/CMJ/article/view/126

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Vol. 65 No. 2 (2021): Chulalongkorn Medical Journal

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Original Articles

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