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Related Concept Videos

Herniated Intervertebral Disc l: Introduction01:29

Herniated Intervertebral Disc l: Introduction

Intervertebral disc herniation refers to the displacement of the nucleus pulposus (the gel-like inner core of the disc) through a tear or weakened area in the annulus fibrosus (the outer fibrous ring). The displaced disc material extends beyond the normal boundaries of the disc space and may compress or irritate nearby spinal nerve roots or, less commonly, the spinal cord.Etiology and Risk FactorsHerniation commonly results from degeneration, in which aging reduces disc hydration and...

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Related Experiment Video

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Novel Mini-open Transforaminal Lumbar Interbody Fusion
05:52

Novel Mini-open Transforaminal Lumbar Interbody Fusion

Published on: June 6, 2025

Fusion after interspinous device placement.

Nai-Feng Tian1, Xiao-Lei Zhang, Yao-Sen Wu

  • 1Department of Orthopaedic Surgery, Second Affiliated Hospital of Wenzhou Medical College, 109 Xueyuanxi Rd, Wenzhou 325000, China. tiannaifeng@163.com

Orthopedics
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Heterotopic ossification, a rare complication, can lead to interspinous fusion after lumbar device placement. This fusion may impede motion preservation, a key goal of these spinal implants.

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Area of Science:

  • Spine surgery
  • Orthopedic implants
  • Biomedical engineering

Background:

  • Lumbar interspinous devices offer motion-preserving stabilization for spinal degeneration.
  • These devices aim to unload facet joints, restore foraminal height, and reduce intradisk pressure.
  • Their popularity has grown as an alternative treatment for spinal conditions.

Observation:

  • A 66-year-old male experienced symptom relief after dynamic interspinous device implantation for lumbar spinal stenosis and disk herniation.
  • 32 months post-implantation, he presented with recurrent back pain following trauma.
  • Imaging revealed significant heterotopic bone formation around the implant.

Findings:

  • Radiographs and CT scans demonstrated interspinous fusion of the implanted device segments 4.5 years after placement.
  • Dynamic radiographs confirmed no implant motion, indicating successful fusion.
  • The patient remained asymptomatic, and no further intervention was required.

Implications:

  • Heterotopic ossification around interspinous devices is a previously unreported complication.
  • This bone formation can compromise the intended motion-preserving function of the implants.
  • Heterotopic ossification represents a potential mid- and long-term complication of dynamic interspinous devices.