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Inverted knee jerk: a neglected localising sign in spinal cord disease.
  1. R S Boyle,
  2. R A Shakir,
  3. A I Weir,
  4. A McInnes


    Two cases are described in which inversion of the quadriceps jerk was observed. It is suggested that the finding of an inverted quadriceps jerk is evidence of a spinal cord lesion at 12, 3, 4 segmental level and has for the lumbar cord the same localising value as the inverted supinator jerk for the cervical cord.

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