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1 results

  • How Much Sciatic Nerve Does Hip Flexion Require?

  • Lawrence R. Robinson, Linda Probyn
  • Journal:
    Canadian Journal of Neurological Sciences / Volume 46 / Issue 2 / March 2019
    Published online by Cambridge University Press:
    30 January 2019, pp. 248-250
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  • Measured nerve conduction velocity in the fibular nerve increases across the knee during hip flexion. This is due to stretching of sciatic and fibular nerves. We modeled the additional nerve length required for the sciatic nerve to course around the flexed hip, based upon distance between the hip and the sciatic nerve on magnetic resonance imaging (MRI). The median distance from the femoral head to the sciatic nerve was 41 mm. The model predicted that 64 mm of sciatic nerve is required for hip flexion. This impacts our understanding of lower limb nerve conduction studies and clinical straight leg raising tests.