PMC3920626_01
(a) Positioning for popliteal approach to the tibial nerve block. (b) Transverse sonogram in the popliteal region showing the tibial nerve as a hyperechoic nodule (arrow).
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Due to the difficulties in situating the patient in the prone position, the distal extremities of the patient were elevated with folded blankets in the supine position (Figure 1(a)). The tibial nerve was identified in the popliteal fold, posterior to the popliteal artery at a depth of 3 cm (Figure 1(b)).
(a) Ultrasound probe placement for common peroneal nerve block at the head of the fibula. (b) Sonogram of the common peroneal nerve at the head of the fibula (arrow). F: fibula.
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Screening was performed in the distal direction over the lateral side of the patient's leg with the linear probe placed transversely on the edge of the patella to identify the CPN (Figure 2(a)). The nerve was visualized posteriorly and laterally to the fibular head, 4 cm distally to the edge of the patella at a depth of 2 cm (Figure 2(b)).