Effect of Nervus Cutaneous Femoris Lateralis-Blockade on Moderate Pain Responders After Total Hip Arthroplasty

Effect of Nervus Cutaneous Femoris Lateralis-Blockade on Moderate Pain Responders After Total Hip Arthroplasty

The patients will be included the 1. or 2. day after surgery. All THA patients will be screened. Those reporting VAS > 40 during active 30 degrees hip flexion will be asked to participate.

Included patients will receive 2xNCFL (singleshot) first placebo (8 ml saline) and then ropivacaine (8 ml ropivacaine 7,5mg/ml) or the other way around (randomized). There will be 45 minutes between the two blockades. The blockades will be ultrasound guided.

Inclusion Criteria:

• THA within 48 hours and VAS>40 during active 30 degrees hip flexion despite conventional pain medication.
• informed consent
• ASA 1-3
• BMI 18-40

Exclusion Criteria:

• Unable to communicate in danish
• Allergic reactions toward drugs used
• Abuse of alcohol/drugs
• Unable to cooperate
• Pregnant women