Optimizing Peripheral Nerve Block Placement in Hip Surgery: A Cadaveric Study Mapping the Posterior Cutaneous...

Area of Science:

• Anesthesiology
• Anatomy
• Pain Management

Background:

• Peripheral nerve blocks (PNBs) are crucial for postoperative pain management after hip surgery.
• Current PNBs targeting the lateral cutaneous nerve of the thigh (LCNT) often provide inadequate analgesia for posterolateral hip pain.

Purpose of the Study:

• To identify the specific nerves innervating the posterolateral hip.
• To determine optimal landmarks for ultrasound-guided PNBs to improve analgesia after hip surgery.

Main Methods:

• Anatomical review of textbooks (n=5) and cadaveric dissections (n=13).
• Ultrasound-guided dye injections in cadavers (n=6) using the "75/25" landmark.
• Further injections in the posterolateral hip to assess nerve staining.

Main Results:

• The subcostal (SCN), iliohypogastric (IHN), and ilioinguinal (IIN) nerves were identified as key innervators.
• The "75/25" landmark effectively targeted the SCN and IHN but inconsistently the IIN.
• A distal "100/75" landmark showed better staining of IHN and IIN branches.

Conclusions:

• The IHN and IIN are the dominant nerves for posterolateral hip innervation.
• A modified "100/75" landmark for ultrasound-guided PNBs is recommended for consistent IHN and IIN blockade.
• This approach may optimize postoperative analgesia and facilitate faster recovery after hip surgery.