Evaluation of Local Anesthetic Diffusion to the Sciatic Nerve During Adductor Canal Block
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Sciatic Nerve, Adductor Canal Syndrome. Basic parameters: from 18 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- France
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Evaluation of Local Anesthetic Diffusion to the Sciatic Nerve During Adductor Canal Block: an Observational Study
Overview
Adductor canal block is an effective analgesic technique for major knee surgery. However, the saphenous nerve block is not sufficient to explain this block's efficiency. It has been shown that adductor canal block can spread to the tibial and fibular nerves through the adductor hiatus. However, this diffusion's frequency has never been measured. The main objective of this study is to assess clinically the frequency of the spread of the adductor canal block to the fibular and tibial nerves.
Detailed description
Adductor canal block is an effective analgesic technique for major knee surgery. The PROSPECT group recommends this block in first intention for locoregional anesthesia in total knee arthroplasty. It has been shown to not be inferior to femoral nerve block in this indication.
The adductor canal block targets the saphenous nerve and, through its spread in the adductor canal, the posterior branch of obturator nerve and the vastus medialis nerve. However, these nerves can't fully explain this block's efficiency.
It has been shown that local anesthetic can spread in the adductor canal to the tibial and fibular nerves through the adductor hiatus. However, this spread is inconstant, and no study has evaluated the frequency of this spread yet.
The main objective of this study is to assess the diffusion's frequency of adductor canal block to fibular and tibial nerves through clinical sensorimotor testing.
Primary outcome measures
- Frequency of local anesthetic's spread to tibial and fibular nerve [Time frame: at 4 hours]
Secondary outcome measures (4)
- Frequency of reduction of sensitivity to cold or touch or reduction in MRC score [Time frame: at 1 hour and at 4 hours]
- Spread of the local anesthetic in the popliteal fossa [Time frame: at baseline]
- Evaluation of the positive and negative predictive value [Time frame: at baseline and 1 hour, 4 hours]
- Clinical alteration assessement [Time frame: at Baseline and at 1 hour and 4 hours]
Eligibility criteria
Inclusion criteria
- patients over 18 years old scheduled for elective knee surgery under general anesthesia
- in our center
- receiving an adductor canal block
Exclusion criteria
- patients cognitively impaired,
- patients suffering from peripheral neuropathy at the lower limb,
- patients receiving an IPACK block or surgical knee infiltration to complete the adductor canal block analgesia.
- patients who refused to take part in this study
- pregnant or breastfeeding patients
- patients under guardianship
- imprisoned patients,
- patients without any medical insurance
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
France · 1 center
- Department of Anesthésia, CHU Raymond Poincaré - APHP — Boulogne-Billancourt
Identifiers
NCT: NCT07301476 · APHP250730 · 2025-A00945-44