Locating the L4-L5 interspace for lumbar puncture: the sacral anatomical interspace landmark method


  • The  novel sacral anatomical interspace landmark (SAIL) method can more accurately identify the L4-L5 interspace for lumbar puncture than the traditional technique using the intercristal line (ICL).

Why this matters

    Lumbar puncture requires accurate identification of the L4-L5 interspace. Errors can result in serious injury (e.g., mechanical trauma) and patient discomfort.

    Given the low accuracy of the classical ICL technique, the SAIL method described could replace ICL in the future.