Assessment in location of sciatic nerve between the ischial tuberosity and the greater trochanter of the femur: A cadaveric study

Background: The location description of the sciatic nerve (SN) of adult between the ischial tu-berosity (IT) and the greater trochanter of the femur (GT) is inconsistent in publications, this impels us to investigate and measure the distance relationship with SN between IT and GT.Methods: Thirty-one adult cadavers were dissected to investigate the distance relationship of SN with the posterior prominent position of the ischial tuberosity (ppIT), the medial edge of IT (mIT) and the lateral prominent position of GT (lGT).Results: SN passed through the point of the junction of medial one-third and middle one-third of a length from ppIT to lGT, and the midpoint of a length from mIT to lGT from the average data of the total studied cadavers. From average data of female and male, the left SN passed through the point of the junction of the medial two-fifths and the lateral three-fifths of the length between mIT and lGT. Between ppIT and lGT, SN located in a range of proportions from 0.1 to 0.6 from medial to lateral. Between mIT and lGT, SN located in a range of proportions from 0.2 to 0.7 from medial to lateral and all SN passed through the middle third of the length.Conclusions: Different bony landmarks draw different location descriptions of anatomic structure. In anatomic study and clinical practice, the utilized bony landmark should be clearly and accu-rately identified the reference point, inaccurate bony landmark can result in erroneous locali-zation of the interested anatomic structure and lead to operation failure or iatrogenic injury.