Analgesic Efficacy of Saphenous Nerve Block in Total Knee Replacement

Phase 4CompletedNCT01991288

Cork University Hospital20 enrolled

Overview

We hypothesize that preoperative saphenous nerve block (SNB) in combination with periarticular local infiltration provides better post operative pain relief (POPR) profile as compared to local infiltration alone

Introduction: Local infiltration analgesia (LIA) is considered acceptable after total knee replacements (TKR) in terms of analgesia, ease of performance, early mobilization and early hospital discharge . Continuous femoral nerve block has been used to enhance post op pain relief (POPR) for TKR but at the expense of motor blockade . A Sub sartorial approach to saphenous nerve block (SNB) spares the motor block . To date the role of saphenous nerve block for POPR in TKR has not been evaluated. Methodology: In order to test this hypothesis, we proposed to carry out a prospective randomized controlled double blinded (surgeon and assessor) trial study. With institutional ethics approval and having obtained written informed consent from each patient, 20 ASA 1 - 3 patients scheduled to undergo TKR under spinal anesthesia +/- sedation were allocated to one of two groups i.e. Group (SNB): patients receiving SNB sub sartorial approach and Group (NSNB): patients not receiving SNB. Group allocation was determined using computer generated random number tables. Sealed envelopes were opened on the day of the surgery by the attending anesthetist responsible for the care of the recruited patient. Postoperative period: Patients were then assessed for pain at rest and on movement on arrival in recovery and then at 6 , 12 and 24 hrs. Visual analogue scale on a 10 cm straight line was used to assess postoperative pain scores as predictive value of post operative analgesia on rest and movement i.e passive flexion of knee to 30 degree . Patients were assessed for any motor block by using maximum tolerable range of active knee flexion (MKF) and maximum range of straight leg raise(MSLR) on arrival in recovery and at 6, 12 and 24 hrs. All patients received regular paracetamol 1g 6 hourly, diclofenac 75 mg 12 hourly, oxycontin 10-20 mg ( depending on age) 12 hourly and oxynorm 10 mg as rescue analgesia.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Post Operative Pain

Interventions

SNB Saphenous Nerve BlockPROCEDURE

Patients in group SNB received an ultrasound guided SNB (a sub sartorial approach) by a single operator with 10 mls 0.5% bupivacaine. At the end of surgery periarticular knee infiltration of 30 mls 0.5% levobupivacaine + 70 mls 0.9% saline + 0.5 mg adrenaline was performed in a staged fashion by the surgeon, beginning with infiltration of the deep structures on tibial surface at 1mm depth around all exposed tissues, medial and lateral collateral ligament origin, all cut surfaces of extensor mechanism, all cut surface of skin and subcutaneous tissue

NSNB Non Saphenous Nerve BlockPROCEDURE

All patients at the end of surgery received periarticular knee infiltration of 30 mls 0.5% levobupivacaine + 70 mls 0.9% saline + 0.5 mg adrenaline, in a staged fashion by the surgeon, beginning with infiltration of the deep structures on tibial surface at 1mm depth around all exposed tissues, medial and lateral collateral ligament origin, all cut surfaces of extensor mechanism, all cut surface of skin and subcutaneous tissue

Eligibility

Sex: ALLMin age: 18 YearsMax age: 85 Years

Medical Language ↔ Plain English

Inclusion Criteria: American Society of Anaesthesia (ASA) Grade I-lll patients Undergoing elective Total Knee Arthroplasty Patients able to consent and understand all the components of the study. Exclusion Criteria: Demented patients Patients having bilateral Knee Replacements Patients unable to comprehend the use of pain scales Allergy to any of the medications used in the study Renal dysfunction Coagulation disorders Peptic ulcer disease precluding use of non-steroidal anti-inflammatory drugs (NSAIDs) Patients unable to use regular opioid medication Any chronic pain condition other than osteoarthritis of the knee.

Locations (1)

Dept. of Anaesthesia & Intensive Care Unit, Cork University Hospital

Cork, Cork, Ireland

Outcomes

Primary Outcomes

Pain on movement at 24 hours time point post operatively

Time frame: 24 hours hours time point

Secondary Outcomes

pain on movement at 6 and 12 hour time point

Time frame: 6 and 12 hours time points

pain at rest at 6, 12 and 24 hours time points

Time frame: 6, 12 and 24 hours time points

Maximum Knee Flexion at 6, 12 and 24 hours time points

Time frame: 6, 12 and 24 hours time points

Maximum Straight Leg Raise Test at 6, 12 and 24 hours time points

Time frame: 6, 12 and 24 hours time points

Time to First request for rescue analgesia

Time frame: 24 hours

Cumulative Opioid consumption in 24 hours

Time frame: 24 hours

Cumulative opioid consumption till discharge

Time frame: till discharge time

6 Minute walk test

Time frame: At 24 hours Post block Conduction

Data from ClinicalTrials.gov

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