Analgesic Efficacy of Saphenous Nerve Block in Total Knee Replacement

Cork University Hospital

Status and phase: Completed; Phase 4

Conditions: Post Operative Pain

Treatments: Procedure: SNB Saphenous Nerve Block; Procedure: NSNB Non Saphenous Nerve Block

Study type: Interventional

Funder types: Other

Identifiers

NCT01991288

JR-0786-GI

Details and patient eligibility

About

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

Full description

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.

Enrollment: 20 patients

Sex: All

Ages: 18 to 85 years old

Volunteers: No Healthy Volunteers

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.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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20 participants in 2 patient groups

SNB Saphenous Nerve block

Experimental group

Description:

Patients received SNB preoperatively at mid thigh level with ultrasound guidance. 10 mls 0.5% bupivacaine was administered for nerve block by the anesthetist. All patients also received peri operative Local Infiltration Analgesia by the surgeon. All patients will receive preoperative oxycontin, peri operative paracetamol and diclofenac. Post operatively all patients received regular paracetamol 1g 6 hourly, Diclofenac sodium 12 hourly and oxycontin 10-20 mg 12 hourly. All patients received standardized spinal block by the same anesthetist, post nerve block for surgery.

Treatment:

Procedure: SNB Saphenous Nerve Block

NSNB Non Saphenous Nerve Block

Active Comparator group

Description:

Patients only received Local Infiltration Analgesia. As per protocol all patients received the same pre, peri and post operative analgesia as described in the experimental group. All patients had a standardized spinal block for surgery.

Treatment:

Procedure: NSNB Non Saphenous Nerve Block