Shamrock - Ultrasound/MR Image Fusion Guided Lumbar Plexus Block

Shamrock - Ultrasound/MR Image Fusion Guided Lumbar Plexus Block

The main objective is to complete a double-blinded randomized controlled crossover trial of lumbar plexus block with the Shamrock technique guided by ultrasound (US)/magnetic resonance imaging (MRI) image fusion vs. the Shamrock technique guided by ultrasound in healthy volunteers.

The investigators will assess block procedure-related parameters, anatomical spread of local anesthetic, and motor and sensory effects.

Inclusion Criteria

• Age ≥ 18 years
• Body mass index (BMI): 18.5 ≤ BMI ≤30
• Written and oral consent to participate
• Normal healthy person (American Society of Anesthesiology Classification I)

Exclusion Criteria:

• Volunteers not abel to speak or understand Danish
• Volunteers not able to cooperate
• Allergy against the medicines used in the study
• Daily use of analgesics
• Drug abuse - according to the investigator's judgment
• Alcohol consumption greater than the recommendations of the Danish National Board of Health
• Contraindication for MRI scan (including pregnancy)
• Volunteers in whom nerve blocks are impossible due to technical reasons or infection
• Volunteers who are incompetent, eg. surrogate consent is unaccepted