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Ultrasound Guided Hip Blocks: What’s New, What’s Changed, and Where is it headed?

Valkyrie Blog Team
5 days ago
3 min read

Ultrasound‑guided hip blocks have undergone a major evolution over the last decade. What used to be a “just do a fascia iliaca” approach has transformed into a precise, anatomy‑driven strategy that tailors the block to the surgical approach, patient frailty, and desired motor‑sparing profile.


Today’s hip block toolbox includes Femoral, Lateral Femoral Cutaneous (LFCN), Fascia Iliaca (infra‑ and suprainguinal), and the Pericapsular Nerve Group (PENG) block, each with updated techniques, evidence, and indications.


This blog breaks down what’s new, what’s changed, and how these blocks fit together in modern hip anesthesia.

1. Femoral Nerve Block: Still Useful, Now More Targeted

The femoral nerve block remains a reliable option for anterior hip analgesia, but recent literature emphasizes precision over volume.

What’s new

  • Lower‑volume techniques (10–15 mL) reduce quadriceps weakness while maintaining analgesia.

  • Ultrasound refinement: Better visualization of the iliopsoas groove and femoral nerve fascicles improves consistency.

  • Comparative trials show femoral blocks provide strong analgesia but impair early mobilization more than PENG or suprainguinal fascia iliaca.

Where it fits now

  • Excellent for hip fracture ED analgesia

  • Useful when motor weakness is not a concern (e.g., preoperative pain control)

  • Less favored for ERAS arthroplasty pathways due to quadriceps involvement

2. Lateral Femoral Cutaneous Nerve (LFCN) Block: Small Block, Big Impact

The LFCN block has gained importance as surgeons increasingly use anterior approaches for total hip arthroplasty.

What’s new

  • High‑resolution ultrasound allows consistent identification of the LFCN between the sartorius and tensor fascia lata.

  • Updated mapping studies show significant anatomical variability—ultrasound guidance dramatically improves success rates.

  • Adjunct role: LFCN block is now routinely paired with PENG or SIFI for complete anterior hip coverage.

Where it fits now

  • Essential for anterior THA

  • Helpful for lateral thigh pain after hip fracture fixation

  • Often combined with fascia iliaca or PENG for multimodal coverage

3. Fascia Iliaca Block: From “Big Volume” to Suprainguinal Precision

The fascia iliaca block has undergone the most dramatic modernization.

Suprainguinal Fascia Iliaca (SIFI): The modern standard

Recent trials show SIFI provides:

  • Broader lumbar plexus coverage (femoral + LFCN + partial obturator)

  • Better analgesia than infrainguinal approaches

  • More predictable spread under ultrasound guidance

What’s new

  • Volume optimization: 20–30 mL is now typical; excessive volumes are discouraged.

  • Motor‑sparing focus: SIFI may cause less quadriceps weakness than femoral blocks, depending on technique.

  • Comparisons with PENG show SIFI provides broader sensory coverage but may be slightly more motor‑impairing.

Where it fits now

  • Hip fracture analgesia

  • THA (posterior or lateral approaches)

  • ED and prehospital pain control

4. PENG Block: The Articular‑Focused Game Changer

The PENG block is the newest addition to hip regional anesthesia and has quickly become a favorite for motor‑sparing analgesia.

What’s new

  • Randomized trials show PENG reduces pain and opioid use after hip arthroplasty.

  • Less quadriceps weakness compared with femoral or fascia iliaca blocks.

  • Stress‑response reduction (hemodynamic and biochemical markers) in elderly arthroplasty patients.

  • Single‑puncture PENG + SIFI technique allows dual coverage with one needle entry—ideal for trauma lists.

Where it fits now

  • ERAS total hip arthroplasty

  • Fragility hip fractures

  • Patients where early mobilization is critical

5. How These Blocks Fit Together: The Modern Hip Block Strategy
For hip fracture (ED or OR)

  • SIFI = broad coverage

  • Add PENG for articular pain

  • Add LFCN if lateral thigh pain is expected

For anterior THA

  • PENG for articular pain

  • LFCN for incision pain

  • Optional SIFI for broader coverage

For posterior/lateral THA

  • SIFI or Femoral

  • PENG optional depending on surgeon preference

For intertrochanteric fracture fixation

  • Single‑puncture PENG + SIFI

  • Add LFCN if incision extends laterally

6. The Future: AI‑Assisted Ultrasound & Low‑Volume Precision

Just like serratus blocks, hip blocks are moving toward:

  • AI‑assisted landmark recognition

  • Low‑volume, high‑precision injections

  • Combined single‑puncture techniques

  • Evidence‑based block selection tailored to surgical approach

The era of “big plexus blocks” is fading. The era of smart, targeted, ultrasound‑guided hip blocks is here.

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References

  1. Diwan S, Gupta A, et al. A Novel Single Puncture Pericapsular Nerve Group‑suprainguinal Fascia Iliaca Block Technique for Postoperative Analgesia in Patients Undergoing Hip Surgery: A Prospective Feasibility Study. Journal of Medical Ultrasound, 2026. ]

  2. Application of ultrasound‑guided regional blocks in the perioperative period of hip arthroplasty: A systematic review and network meta‑analysis. Journal of Clinical Anesthesia, 2026.

  3. Effect of PENG vs suprainguinal fascia iliaca block on postoperative analgesia and stress response in elderly hip arthroplasty patients. BMC Anesthesiology.

 
 
 

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