Final answer:
In performing a popliteal nerve block, the practitioner must consider the borders of the popliteal fossa, the nerve anatomy, the nerves that will not be blocked, and the depth of injection for effective and safe anesthesia.
Step-by-step explanation:
In a popliteal nerve block, there are several crucial factors to consider. First and foremost, it is important to have a thorough understanding of the borders of popliteal fossa as well as the nerve anatomy within the fossa. This knowledge will guide the practitioner in proper needle placement to achieve effective anesthesia. Furthermore, consideration of which nerve of the lower extremity is not blocked by the popliteal block is essential in planning the procedure, as other forms of anesthesia may need to be supplemented to achieve complete analgesia. Lastly, the depth of injection is vital to ensure that the block is effective without damaging neighboring structures.