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Normal inter-limb differences during the straight leg raise neurodynamic test: a cross sectional study.

Benjamin S Boyd1, Philip S Villa

  • 1Department of Physical Therapy, Samuel Merritt University, Oakland, CA 94609, USA. bboyd1@samuelmerritt.edu

BMC Musculoskeletal Disorders
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Summary

Inter-limb differences in straight leg raise (SLR) neurodynamic testing are typically small, averaging under 6 degrees. These asymmetries are not influenced by demographic factors, making them a reliable measure for assessing lower quarter nervous system sensitivity.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Orthopedics

Background:

  • The straight leg raise (SLR) neurodynamic test assesses lower quarter nervous system sensitivity.
  • Range of motion in SLR varies due to factors like age, sex, and activity level.
  • Inter-limb differences may offer a normative measure independent of demographics.

Purpose of the Study:

  • Determine normal asymmetries between limbs during SLR testing in healthy individuals.
  • Investigate the relationship between SLR range of motion and demographic characteristics.

Main Methods:

  • Limb elevation angle measured with an inclinometer during SLR with ankle in plantar flexion (PF/SLR) and neutral dorsiflexion (DF/SLR).
  • Two phases: Phase 1 used an ankle brace; Phase 2 used manual positioning.
  • Involved 40 healthy, asymptomatic participants.

Main Results:

  • Average PF/SLR range of motion: Left 57.1°, Right 56.7°. Average DF/SLR range of motion: Left 48.5°, Right 48.9°.
  • SLR range of motion correlated with weight, BMI, sex, and activity level.
  • Intra-individual differences averaged 5.0° (PF/SLR) and 4.1° (DF/SLR), not correlated with demographics. No significant difference between phases.

Conclusions:

  • SLR range of motion is influenced by sex, weight, BMI, and activity level, contributing to variability.
  • Inter-limb differences in SLR are consistently small (95% confidence < 11° in 90% of healthy individuals).
  • Inter-limb differences are unaffected by demographics, suggesting their value for clinical interpretation.