Aim of this study is to demonstrate the advantages of intraneural injection over extraneural injection in terms of onset and duration on peripheral block. In addition we will evaluate the frequency of possible adverse effects.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
88
BBraun Ropivacaine 1% 12ml injection divided in each sciatic components under echographic guidance with a PAJUNK SonoPlex 22G needle.
BBraun Ropivacaine 1% 12ml extraneural injection around sciatic nerve under echographic guidance with a PAJUNK SonoPlex 22G needle.
Istituto Ortopedico G. Pini
Milan, Milano, Italy
onset time
Pinprick test evaluation on sciatic nerve territory: With a 22G needle the blinded operator will assess sensitiveness to puncture and then assign a score every 2 minutes for 30 minutes. A score of 0 will describe no sensation to puncture, on the other hand a score of 1 will be assigned if sensation to puncture is still present. Evaluation of motor blockade: Plantar and dorsal flexion of the foot will be evaluated for motor blockade of sciatic nerve. A score of 1 will be assigned if foot movement is conserved, 2 if is impaired and 3 when disappears. Onset time is described as the time at which pinprick score turns to 0 and motor blockade score turns to 3.
Time frame: every 2 minutes for a maximum of 30 minutes
success rate in each group
Success rate is described as the percentage of subjects with an onset time within 30 minutes in a group among all subjects treated in that group
Time frame: at 30 minutes
Nerve injuries
Neurophysiological and clinic evaluation will be assessed either with clinical examination and electrophysiological tests by a neurophysiologist eventually evidencing any movement impairment or dysesthesia in the sciatic territory.
Time frame: 1, 5 weeks and at 6 months after surgery
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.