Location of the perforator artery according to origin and lower leg region The positions of the perforator arteries from the anterior tibial artery are mainly concentrated at the middle third position (average is 15.43 ± 3.27 cm above the medial ankle), the perforator arteries from the 13 posterior tibial artery are mainly concentrated at the middle third (mean 16.45 ± 3.23 cm on inner ankle).