Inverted knee jerk: a neglected localising sign in spinal cord disease

R S Boyle; R A Shakir; A I Weir; A McInnes

doi:10.1136/jnnp.42.11.1005

. 1979 Nov;42(11):1005–1007. doi: 10.1136/jnnp.42.11.1005

Inverted knee jerk: a neglected localising sign in spinal cord disease.

R S Boyle, R A Shakir, A I Weir, A McInnes

PMCID: PMC490393 PMID: 501364

Abstract

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.