Efficacy of Fascia Iliaca Block Versus Intraoperative Nerve Infiltration During Anterior Hip Replacement Surgery

Not Applicable

Completed

Conditions: Pain, Postoperative

Interventions: Procedure: Intra-operative FICB Group
Procedure: Pre-operative Ultrasound FICB Group

Registration Number: NCT01693900

Lead Sponsor: Randy Fayne, DO

Brief Summary: Surgical trauma causes nerve sensitization leading to amplification and prolongation of postoperative pain. In experimental studies, pre-injury neural blockade using local anesthetics has been shown to reduce post-injury sensitization of the central nervous system, while similar techniques applied after the injury had less or no effect (FILOS). Investigators have therefore designed this study to examine the timing of FICB (pre-operatively versus intra-operatively) on postoperative pain in patients undergoing anterior hip replacement surgery.

Detailed Description: Though still uncommonly used in the United States, the popularity of the anterior approach for total hip replacement is rapidly growing because of its clinical advantages. Rehabilitation is simplified and accelerated, dislocation risk is reduced, leg length is more accurately controlled, and incision is smaller than with traditional approaches (GOEBEL). Nevertheless, although pain is lessened, it is still considerable, and new techniques have been developed to improve postoperative pain control for this procedure.

Surgical incision and tissue trauma result in postoperative pain. Regional pain blocks, especially when done under ultrasound guidance, have proven to be extremely effective at reducing postoperative pain and improving patient satisfaction. One such block, the fascia iliaca compartment block (FICB), has been shown to be effective in controlling pain associated with surgery involving the hip and femur.

Although possible without ultrasound guidance, using this technique allows for identification of specific tissue planes and precise placement of medication near the nerves responsible for postoperative pain. Using ultrasound, the superficial fascial layer of the iliopsoas muscle is identified at the anterior edge of the ilium, and a needle is placed just beneath that fascia. A high volume of local anesthetic is then injected under ultrasound guidance, ensuring cephalad spread of medication, in an attempt to provide anesthesia of the lateral femoral cutaneous, femoral and obturator nerves.

Unlike other approaches to hip replacement, anterior repair allows for direct visualization of the fascial layers described above. This allows for direct injection of local anesthetic beneath this fascia, potentially obviating the need for preoperatively performed, ultrasound guided, FICB. The primary differences in approach (ultrasound guided preop versus direct visualization intraop) is the timing of injection, and it is unclear if nerve block prior to or after tissue damage affects postoperative pain in these patients.

Surgical trauma causes nerve sensitization leading to amplification and prolongation of postoperative pain. In experimental studies, pre-injury neural blockade using local anesthetics has been shown to reduce post-injury sensitization of the central nervous system, while similar techniques applied after the injury had less or no effect (FILOS). Investigators have therefore designed this study to examine the timing of FICB (pre-operatively versus intra-operatively) on postoperative pain in patients undergoing anterior hip replacement surgery.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 50

Inclusion Criteria

Adults 18-65 years of age
Female patients must be surgically sterile, postmenopausal or have a negative pregnancy test on the day of surgery
Willing and able to sign the informed consent approved by the Institutional Review Board (IRB)
Willing and able to complete the study procedures and pain scales, and to communicate meaningfully in English with study personnel
Elective anterior hip replacement to be performed at Beaumont Hospital, Royal Oak
American Society of Anesthesiologists physical status classification 1, 2, and 3 (patients that have either no systemic illness, or mild to moderate systemic disease, eg. asthma, diabetes or hypertension)

Exclusion Criteria

History of allergy to study medications including ropivacaine and other local anesthetic agents of the amide-type
Enrollment in concurrent research study
Female patients who are pregnant or lactating, or who have a positive urine pregnancy test
Opioid tolerant, ie, A patient taking a narcotic > 30mg per day morphine equivalent. (Source: www.globalrph.com/narcotic.cgi) for pain in the 2 months prior to surgery
A medical condition that in the investigator's opinion could adversely impact the patient's participation or safety, conducts of the study, or interferes with the pain assessments
Previous hip arthroplasty (partial or total) of the index hip
History of illicit drug use, or prescription medicine or alcohol abuse within the past 2 years

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Intra-operative FICB Group	Intra-operative FICB Group	Enrolled subjects will receive FICB with 50cc of 0.3% ropivacaine. Blocks will be performed intra-operatively under direct surgeon visualization, in the operating room.
Pre-operative Ultrasound FICB Group	Pre-operative Ultrasound FICB Group	Enrolled subjects will receive FICB with 50cc of 0.3% ropivacaine. Blocks will be performed under an ultrasound guidance device with an in-plane technique by a single study investigator, in the preoperative area.

Primary Outcome Measures

Name	Time	Method
Postoperative Pain During Recovery	From discharge from PACU until discharge from hospital, an average of 2-3 days	Pain assessments were made by the subject using a 10.0 cm VAS (scale 1-100 where 1=minimal pain and 100= worst pain imaginable) prior to any request for pain medication. Up to 40 values per patient were averaged.
Postoperative Pain During PACU Admission	From time of PACU admission until discharge from PACU, an average of 2 hours	Pain assessments will be made by the subject using a 10.0 cm Visual-Analog scale (VAS) (scale 1-100 where 1=minimal pain and 100= worst pain imaginable) as follows at each time point: * Baseline assessment in Preoperative area * Upon arrival to the post-anesthesia care unit (PACU) * Every 15 min (+/- 2 minutes) thereafter and prior to any request for pain medication until PACU discharge All pain scores per subject from the time of PACU admission until discharge from PACU will be averaged to obtain one data point per subject.

Secondary Outcome Measures

Name	Time	Method
Patient Satisfaction With Postoperative Pain Control	At the 3 week post-op visit	Patient satisfaction with postoperative pain control, using a 10 point Likert scale where 1=extremely dissatisfied and 10= extremely satisfied. Patients were called 3 weeks post-op to determine pain control satisfaction.
Incidence of Adverse Events	From the signature on the informed consent document for the duration of the hospital stay, an expected average of 2 - 3 days.	Measure is count of participants experiencing any adverse event. Adverse events will be reported by the patient (or when appropriate, staff personnel) during hospitalization.