Comparison of PENG Associated with LFCN Block Versus FICB for Multimodal Analgesic Management in THA

Pericapsular Nerve Group (PENG) Associated with Lateral Femoral Cutaneous Nerve (LFCN) Block Versus FIC Block for Total Hip Replacement Surgery: a Double Blind Randomized Controlled Trial

Optimal pain control with limited muscle weakness is paramount for a swift initiation of physical therapy and ambulation. Fascia iliaca compartment block (FIC) has been recommended since it offers the best pain control with low risk of motor block. Pericapsular nerve group block (PENG) with lateral femoral cutaneous block (LFCN) has been proposed as an effective alternative to FIB that offers similar pain control with a considerably lower risk of motor block. The aim of this study is to compare the afore mentioned blocks and determine which one yielded the least degree of quadriceps femoris muscle weakness and the better pain control (the lowest NRS score with least need for opioids).

This single-center, double blinded RCT investigation will be conducted at ASST Nord Milano - Bassini hospital. The study was approved by the ethics committee "Comitato Etico Territoriale Lombardia 3".

Each patient undergoing elective total hip replacement surgery with anterior approach will be subjected (unless contraindicated) to subarachnoid neuraxial anesthesia and immediately afterwards to a peripheral analgesic block: the FIC block or the association of PENG and FCLN block. The choice of block type will be randomized.

At the end of the procedure, a clinician unaware of the anesthetic technique used will assess the degree of residual motor block. Simultaneously, he will assess pain control in terms of NRS (Numerical Rating Scale) and the need for opioid use.

Inclusion Criteria:

• elective total hip replacement surgery for non-traumatic hip disease,
• THA (total hip arthroplasty) with lateral approach
• age >18 years,
• signed consent form for spinal anesthesia and peripheral nerve block provided by the patient or legal guardian if appointed

Exclusion Criteria:

• Non elective THA
• Lack of consent to the procedure
• Contraindications to performing neuraxial anesthesia (i.e. Signs suggestive of puncture site infection, INR > 1.5, aPTT > 1.5, PLT < 40.000)
• Documented or suspected allergy to local anesthetics