Inroduction: For transsacral block of sacral nerves in analgesia and anesthesia of the rectal, anal or urethral region the dorsal sacral foramina are used.To find solution of this by identifying additional anatomical landmarks and measurements of dorsal sacral foramina for transsacral nerve block.
Materials & Method: Total 100 complete and undamaged adult, dry sacrums were measured with a vernier caliper (accurate to 0.1 mm). Dorsal sacral foramina of the sacrum were taken as points.
Calculations and analyses were expressed as mean (SD), median and range using Open Office 3.2.0 spreadsheet version for Linux (Ubuntu 10.04).
Results: The average distance between the two superolateral sacral crests was 60.61 (SD 6.71) mm. Distance between dorsal sacral foramina vertical right side 1st to 2nd 14.05 (SD 2.35)mm, 2nd to 3rd 12.33 (SD 1.84)mm, 3rd to 4th 11.26 (SD 2.35)mm and vertical left side 1st to 2nd 14.18 (SD 2.61)mm, 2nd to 3rd 12.18 (SD 1.95)mm, 3rd to 4th 10.78 (SD2.42)mm. Transverse distance between dorsal sacral foramina 1st to 1st 34.72 (SD 3.97)mm, 2nd to 2nd 29.43 (SD 3.51)mm, 3rd to 3rd 25.58 (SD 3.46)mm, 4th to 4th 24.63 (SD 3.22)mm.
Conclusion: Measurements of dorsal sacral foramina can be used for transsacral nerve block.
Sacrum; Transsacral approach; Dorsal sacral foramen; Transsacral block