Involuntary flexion of the lower limbs is seen in a variety of conditions. It may be due, for instance, to changes in the muscles themselves, as in the myopathic type of senile paraplegia,1 or to the unopposed action of the flexor muscles of the hip following injury to the cauda equina. Spasm of the flexor muscles is associated at times with painful disorders of the lumbar portion of the spine even when objective evidence of involvement of the nervous system is lacking. Spastic paraplegia in flexion resulting from a release of reflex mechanisms in the lumbosacral part of the cord, on the other hand, is of more than passing interest. To any one interested in the physiologic implications of lesions of the spinal cord and the general problem of spastic paralysis few subjects can be more fascinating.
Contracture in flexion and involuntary movements of the lower extremities were described
DANIELS LE. PARAPLEGIA IN FLEXION. Arch NeurPsych. 1940;43(4):736–764. doi:10.1001/archneurpsyc.1940.02280040123008
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