Displacement of Popliteal Sciatic Nerve Catheters After Major Foot and Ankle Surgery

Study Overview
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Brief Summary
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Displacement of popliteal sciatic nerve catheters after major foot and ankle surgery. A randomized controlled double blinded MRI study comparing long versus short axis catheter placement. Which procedure for insertion of nerve catheters for postoperative pain after major foot and ankle surgery is the best

Conditions
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Postoperative Pain, Regional Anesthesia

Intervention / Treatment
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* Procedure: Ultrasound guided short axis (SAX) placement of sciatic nerve catheters
* Procedure: Ultrasound guided long axis (LAX) placement of sciatic nerve catheters
* Device: B Braun Contiplex S catheter


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age ≥ 18 y. Major foot and ankle surgery postoperativ pain treatment with sciatic nerve catheter r Written and informed concent Exclusion Criteria: Patient uanble to cooperate Patients not speaking and understanding Danish or English Patiens in immunosuppresive treatment Patienter with neuropathys in lower extremities Allergies to the in the protocole listes medicines A daily opoid intake Pregnant women Patients not meeting MR-criterias (metal, claustofobia...)

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: SAX<br>Ultrasound guided short axis (SAX) placement of sciatic nerve catheters | Procedure: Ultrasound guided short axis (SAX) placement of sciatic nerve catheters<br>* Sonosite EDGE ultrasound scanner guided insertion of a B Braun Contiplex S catheter along the short axis of the sciatic nerve behind the knee.<br>Device: B Braun Contiplex S catheter<br> <br> |
| Active Comparator: LAX<br>Ultrasound guided long axis (LAX) placement of sciatic nerve catheters | Procedure: Ultrasound guided long axis (LAX) placement of sciatic nerve catheters<br>* Sonosite EDGE ultrasound scanner guided insertion of a B Braun Contiplex S catheter along the long axis of the sciatic nerve behind the knee.<br>Device: B Braun Contiplex S catheter<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Frequency of nerve catheter displacement |  | 48 hours after catheter placement | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Opioid comsumption |  | Within first 48 hours postoperatively | 
| Number of rescue blocks |  | Within 48 hours postoperatively | 
| Postoperativ pain after local anesthetic injection via sciatic nerve catheter |  | Within 48 hours postoperatively | 
| MR evaluated distribution of local anesthetic after injection MR-contrast |  | 48 hours after catheter placement | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Postoperative pain, Regional anesteshia, Nerve catheters, Sciatic nerve catheters