total knee arthroplasty
Conditions
Interventions
Sponsors
Eligibility
Inclusion criteria
Inclusion criteria: Informed consent, American Society of Anesthesiologists (ASA) classification I to III, age older than 18 years
Exclusion criteria
Exclusion criteria: no informed consent, ASA classification IV or V, infection near the insertion side, coagulation disorder, allergy to local anesthetics, pre-existing neurologic dysfunction, prior vascular surgery near the insertion side, inability to understand the patient controlled analgesia device, pregnancy or lactation period, known hepatic or renal insufficiency, age
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Reaching of discharge criteria (90 degree flexion of the knee, no infection, pain on the visual analogue scale (VAS) lower than 4 (scale 0-10) | — |
Secondary
| Measure | Time frame |
|---|---|
| 1. functional results at discharge and after 6 weeks and one year after the operation, 2. Analgesic consumption: use of morphine and tramadol, pain measured by VAS postoperatively on day 0, 1, 2 and 3 during rest and movement, respectively, 3. Postoperative nausea and vomiting (PONV, 0: absence, 1: mild, 2: severe), 4. Effect of removing catheters on functional aspects (loss of functional capacity after removing catheters), 5. Patient overall satisfaction (measured using the Oxford knee questionnaire, a score with good reliability, content validity and construct validity in patients subjected to TKA15;16)Patient satisfaction with regional blockade procedure (school marks), 6. Time necessary to place catheters, 7. Amperage of stimulation of motor response, 8. Onset of motor and sensory block | — |
Countries
Netherlands