The purpose of this study is to compare the efficacy of 75 mg of Pregabalin and 150 mg of Pregabalin in postoperative pain control after TKA.
After being informed about the study and potential risks, all patients giving written informed consent will be chosen for eligibility for the study entry. At the day before surgery date, patients who meet the eligibility criteria will be randomized in a double-blind manner (participant and investigator) in a 1:1 ratio to 75 mg of Pregabalin and 150 mg of Pregabalin groups.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
82
1 tab of Pregabalin Brillior 75 mg and 1 tab of Placebo
2 tabs of Pregabalin Brillior 75 mg
Thammasat University Hospital
Pathum Thani, Changwat Pathum Thani, Thailand
Difference on 100-mm Visual analog scale (VAS) Pain Score between 75 mg of Pregabalin and 150 mg of Pregabalin groups
* The 100-mm VAS pain score is a self-reported instrument assessing pain scores. * Participants will assess the VAS pain score at rest and on-movement * VAS Pain at rest is evaluated when the participant is at rest. * VAS Pain on-movement is evaluated on active extension and flexion of the operated knee using mean scores between the two. * Possible scores range from 0 (no pain) to 100 (worst imaginable pain) * Higher scores mean a worse pain
Time frame: 6, 12, 18, 24, 48 hours & 2, 6, 12 weeks after surgery
Difference on Morphine consumption between 75 mg of Pregabalin and 150 mg of Pregabalin groups
Amount of Morphine consumption as rescue pain control reported as mg per day
Time frame: From postoperative period until 48 hours after surgery
Difference on side effects between 75 mg of Pregabalin and 150 mg of Pregabalin groups
Common of side effects of Pregabalin and Morphine including sedation, dizziness, visual disturbances, nausea and vomiting
Time frame: 6, 12, 18, 24, 48 hours & 2, 6, 12 weeks after surgery
Difference on length of stay between 75 mg of Pregabalin and 150 mg of Pregabalin groups
Time to discharge
Time frame: From postoperative period until 48 hours after surgery
Difference on time to ambulation between 75 mg of Pregabalin and 150 mg of Pregabalin groups
Time from operation to ambulation before hospital discharge
Time frame: From postoperative period until 48 hours after surgery
Difference on Range of motion between 75 mg of Pregabalin and 150 mg of Pregabalin groups
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\- Flexion and extension angle of the knee is measured by a long-arm goniometer
Time frame: 2, 6, 12 weeks after surgery
Difference on Knee Society Score between 75 mg of Pregabalin and 150 mg of Pregabalin groups
* The Knee Society Score is a validated, objective scoring system to evaluate patient's functional abilities before and after total knee arthroplasty * The Knee Society Score has 2 sections including Knee Score and Functional Score with both sections scored from 0 to 100 * Higher scores on the Knee Society Score indicate better knee conditions
Time frame: 2, 6, 12 weeks after surgery
Difference on Knee injury and Osteoarthritis Outcome Score between 75 mg of Pregabalin and 150 mg of Pregabalin groups
* The Knee injury and Osteoarthritis Outcome Score is a validated, patient reported joint-specific score to assess patient pain (9 items), other symptoms (7 items), function in daily living (17 items), function in sport and recreation (5 items), and knee related quality of life (4 items) * The Knee injury and Osteoarthritis Outcome Score range from 0 to 100 * Higher scores on the Knee injury and Osteoarthritis Outcome Score indicate better knee conditions
Time frame: 2, 6, 12 weeks after surgery
Difference on Time up-and-go test between between 75 mg of Pregabalin and 150 mg of Pregabalin groups
* The Time up-and-go test (TUGT) measures the time (seconds) that the patient takes to rise from a chair and walk for 3 meters. Then, he or she turns around and comes back to the seat at the initial position. * They were permitted to use walking aids if they wished. * TUGT was a reliable and valid test for quantifying functional mobility.
Time frame: 2, 6, 12 weeks after surgery
Difference on 2-minutes walking test between 75 mg of Pregabalin and 150 mg of Pregabalin groups
* Participants were instructed to walk for 2 minutes at their normal pace up and down a designated corridor, turning around at each end of the corridor without stopping * They were permitted to use walking aids if they wished. * The results were recorded as the total distance walked in meters.
Time frame: 2, 6, 12 weeks after surgery