Table 1 Descriptions and reliability/reproducibility of the four distances between bony landmarks and adjacent nerves

A acetabular rim to FN (Fig. 1a)

In axial images, the cut of largest diameter of the femoral head was chosen after tracing nearby cuts. The anterior acetabular rim at the 3 o’clock position on the right side, or the 9 o’clock position on the left side, was defined as “anterior acetabular rim.” The closest distance between this point and the femoral nerve was measured

0.92 (0.82–0.97)

0.90 (0.82–0.96)

S acetabular rim to SGN (Fig. 1b)

In coronal images, the cut of largest diameter of the femoral head was chosen after tracing nearby cuts. The superior acetabular rim at the 12 o’clock position was defined as “superior acetabular rim.” The closest distance between this point and the superior gluteal nerve was measured

0.97 (0.88–0.98)

0.91 (0.86–0.93)

P acetabular rim to SN (Fig. 1c)

In axial images, the cut of largest diameter of the femoral head was chosen after tracing nearby cuts. The posterior acetabular rim at the 9 o’clock position on the right side, or the 3 o’clock position on the left side, was defined as “posterior acetabular rim”. The closest distance between the point and the sciatic nerve was measured

0.92 (0.85–0.94)

0.93 (0.88–0.96)

G to SN (Fig. 1d)

In axial images, the most lateral point of the greater trochanteric ridge was chosen after tracing nearby cuts. The closest distance between this point and the sciatic nerve was measured

0.97 (0.92–0.99)

0.96 (0.90–0.98)