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British Journal of Anaesthesia, 1985, Vol. 57, No. 3 333-336
© 1985 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

RESIN INJECTION STUDIES OF THE LUMBAR EXTRADURAL SPACE

G. R. HARRISON, B.SC., M.B., B.S., F.F.A.R.C.S., I.G. PARKIN, M.B., CH.B. and L. SHAH, M.B., CH.B., F.F.A.R.C.S.

University Department of Anaesthetics, Queen Elizabeth Hospital Birmingham B15 2TH
Department of Anatomy, University of Birmingham Birmingham B15 2TT
Dudley Road Hospital Birmingham, B18 7QH

Two resin injection studies of the lumbar extradural space were performed to elucidate its size and shape. To counteract the lack of cerebrospinal fluid pressure in the cadaver, the subarachnoid space was filled with water. In group 1, the extradural injection of resin caused an immediate increase in subarachnoid pressure. The casts produced varied in thickness, but were situated predominantly in the dorsomedial and dorsolateral regions of the spinal canal. Thin anterior spread occurred in 40% of cases. In group 2, resin was injected to the subarachnoid space before the extradural injection of dyed resin. The resulting extradural casts were thinner than in group 1, but the distribution of resin was similar. The problems of interpreting resin casts are discussed in relation to the results obtained, with reasons for suggesting that the extradural space is only potential.


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