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Related Experiment Videos

Nerve root pressure in lumbar disc herniation.

K Takahashi1, I Shima, R W Porter

  • 1Department of Orthopaedic Surgery, Saitama Medical School, Japan.

Spine
|October 21, 1999
PubMed
Summary
This summary is machine-generated.

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Lumbar disc herniation causes significant nerve root compression, averaging 53 mm Hg. This pressure correlates with neurological deficits but not straight leg raise limitations.

Area of Science:

  • Neurosurgery
  • Spinal Surgery
  • Orthopedics

Background:

  • The actual pressure exerted by lumbar disc herniation on nerve roots in clinical settings remains largely unquantified.
  • Understanding this pressure is crucial for diagnosing and managing nerve root impingement.

Purpose of the Study:

  • To quantify the contact pressure between lumbar disc herniations and adjacent nerve roots in patients undergoing surgery.
  • To investigate the correlation between measured nerve root pressure and various clinical features.

Main Methods:

  • Nerve root pressure was measured in 34 patients with lumbar disc herniation during open discectomy using a transducer.
  • Pressure readings were taken before and after surgical decompression (laminotomy and discectomy).
  • Contact pressures were compared with clinical data, including straight leg raising, symptom duration, age, neurologic deficits, and trunk list.

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Main Results:

  • Pre-discectomy nerve root pressures ranged from 7 to 256 mm Hg, with a mean of 53 mm Hg.
  • Post-discectomy, all patients showed 0 mm Hg contact pressure.
  • Higher nerve root pressures were significantly associated with the presence of neurologic deficits and trunk list.

Conclusions:

  • Lumbar disc herniation exerts a mean contact pressure of 53 mm Hg on nerve roots, as measured during surgery.
  • Nerve root pressure magnitude did not correlate with straight leg raising limitations but was significantly associated with the severity of neurologic deficits.