The purpose of this research study is to determine if the insertion site of a perineural catheter, or tiny tube placed next to the nerves that go to the hip which you will have surgery, affects the amount of pain relief that is experienced after surgery.
To determine the association between perineural catheter location and postoperative analgesia, analgesic requirements, ambulatory distance, and flexion following hip arthroplasty. Primary Hypothesis: Differing the catheter insertion site (femoral vs. psoas compartment) for a perineural local anesthetic infusion is not associated with lower pain scores during the 24-hour period beginning the morning following hip arthroplasty.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
50
Patients, undergoing hip arthroplasty or hip resurfacing will be randomized to one of two groups: femoral nerve block or psoas compartment nerve block. Patients randomized to femoral nerve block will receive this block prior to surgery. Patients randomized to psoas compartment nerve block will receive this block prior to surgery. Both patients will receive Mepivicaine via catheter prior to surgery and following surgery, Ropivicaine via pain pump.
UCSD Medical Center
San Diego, California, United States
Patient's mean pain score (NRS) during perineural infusion as measured by the nursing staff at UCSD and entered in the computer system.
Time frame: 24 hours beginning 7:30am day following surgery
Analgesic used, as reported by nursing staff in the UCSD computer system.
Time frame: 3 days following surgery
Patient's ambulation distance as recorded by therapist (occupational or physical) in the UCSD computer system.
Time frame: 3 days following surgery
Hip flexion, in degrees measured with a standard goneometer, as recorded by therapist (occupational or physical) in the UCSD computer system.
Time frame: 3 days following surgery
Infusion duration of pain pump, measured on the pump itself in hours and minutes.
Time frame: 3 days following surgery
Duration of hospital stay, in hours, as reported in the UCSD computer system.
Time frame: 3 days following surgery
Surgical/anesthetic adverse events as reported by hospital staff
Time frame: day of surgery and 3 days following
Experiences of patient during the infusion and following, as reported to study staff in a phone conversation, one week following surgery.
Time frame: 1 week following surgery
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