The Anatomic Relationship of the Tibial Nerve to the Common Peroneal Nerve in the Popliteal Fossa: Implications for Selective Tibial Nerve Block in Total Knee Arthroplasty

Table 1

Demographics.

	Mean
Age (years)	67.3 ± (11.1)
Height (cm)	162.2 ± (8.6)
Weight (kg)	77.2 ± (12.8)
BMI (kg/m^2)	29.5 ± (4)
Leg length (cm)	33.5 ± (4)
Leg circumference (cm)	52.8 ± (7.7)
Distance
Bifurcation of SN from popliteal crease (cm)	4.8 ± (1.6)
Spread of LA from popliteal crease (cm)	4.7 ± (1.9)
Spread of LA proximal to bifurcation (cm)	−0.0 ± (2.5)

Values expressed as mean and ± standard deviation. For spread of LA, + values represent spread reaching proximal to the bifurcation and − values represent spread reaching distal to the bifurcation. SN = sciatic nerve; LA = local anesthetic.