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Normative sciatic nerve excursion during a modified straight leg raise test.

Colette Ridehalgh1, Ann Moore2, Alan Hough3

  • 1School of Health Professions, University of Brighton, Robert Dodd Building, 49 Darley Rd., Eastbourne BN20 7UR, UK.

Manual Therapy
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

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Sciatic nerve motion during the straight leg raise (SLR) is significant, with considerable variation between individuals. Increased hip flexion in SLR leads to greater sciatic nerve excursion, challenging assumptions about pre-loading effects.

Area of Science:

  • Neurology
  • Biomechanics
  • Medical Imaging

Background:

  • Limited data exists on sciatic nerve (SN) movement during straight leg raise (SLR).
  • Understanding SN excursion is crucial for diagnosing and managing nerve-related conditions.

Purpose of the Study:

  • To quantify normative ranges of SN excursion during a modified SLR using real-time ultrasound.
  • To investigate the effect of hip flexion angles on SN motion.

Main Methods:

  • Real-time ultrasound was used to scan the SN in the posterior thigh of 16 asymptomatic participants.
  • Nerve excursion was measured in transverse and longitudinal planes during knee extension with hip flexion at 30° and 60°.
  • Ultrasound data was analyzed offline using cross-correlation software.
Keywords:
B mode ultrasoundNerve excursionNeurodynamicsStraight leg raise

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Main Results:

  • Sciatic nerve excursion ranged from 6.4-14.7 mm (30° hip flexion) and 5.1-20.2 mm (60° hip flexion).
  • Mean SN excursion was significantly greater with 60° hip flexion (p=0.02).
  • Most nerves moved superficially, and a majority (10/16) shifted laterally during knee extension.

Conclusions:

  • Significant between-subject variation in SN excursion exists during modified SLR.
  • Greater hip flexion increases SN excursion, suggesting pre-loading may not consistently reduce motion.
  • These findings provide normative data for SN biomechanics during SLR.