Fig. 5.

Facet joint pain radiation. Posterior aspect of lower limb. Blue: from most frequent (dark blue), to less frequent (light blue) radiating pain areas. Dark blue: pain limited to lower back. Intermediate blue: radiating pain to the posterior aspect of the buttocks. Light blue: radiating pain to the posterior aspect of the lower limbs, may extend lower than the knee level. Green: anterior aspect of lower limb possible radiation areas. a anterior aspect of the lower limb (green). b posterior aspect of the lower limb etc