The purpose of this study is to evaluate the effect of adductor canal block (ACB) vs. placebo on muscle strength, mobility and pain on the first postoperative day after total knee alloplastic (TKA).
Patients will be included on the first day after TKA surgery and randomized in two groups. Each group will receive 2 ACB with a 1 hour interval, one ACB with an active drug, Ropivacaine, and another ACB with a placebo drug, Saline. At T0, arm ACB\_active/placebo will receive the active ACB with Ropivacaine followed by the placebo ACB at T60 (60 minutes after T0). At T0, arm ACB\_placebo/active will receive the placebo ACB with Saline followed by the active ACB with Ropivacaine at T60 (60 minutes after T0). Outcome measurements will be made at T60, 1 hour after the first ACB, and the difference in outcome between the groups will be compared. Baseline values will be measured prior to the first ACB. Final measurements at T120 (120 minutes after the initial ACB), will determine if the differences between the groups are eliminated, since both groups then have received an active ACB.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
64
Gentofte Hospital
Hellerup, Denmark
Difference between groups in muscle strength of the quadriceps femoris muscle.
Muscle strength is assessed as maximum voluntary isometric contraction (MVIC) using a hand-held dynamometer.3 consecutive measurements will be made and the average used. Results for each group will be presented as percentage of baseline values. The primary outcome is the difference in MVIC between the groups.
Time frame: 60 minutes after first ACB (T60)
Difference between groups in muscle strength of the quadriceps femoris muscle.
Same as primary outcome
Time frame: 120 minutes after initial ACB (T120)
VAS pain scores at rest
Pain at rest (VAS 0-100 mm) one hour after the first and second ACB. Results will be compared between the two groups. VAS pain scores at rest will be inquired before any other outcome measurements.
Time frame: 60 minutes after the initial ACB (T60) and 120 minutes after initial ACB (T120)
VAS pain score during TUG test.
Highest VAS (0-100 mm) pain score during TUG test will be inquired for each TUG test. Results will be compared between the two groups.
Time frame: 60 minutes after the initial ACB (T60) and 120 minutes after initial ACB (T120
Timed Up and Go(TUG) test
Time (seconds) to complete a TUG test measured one hour after the first and second ACB. Results will be compared between the two groups.
Time frame: 60 minutes after the initial ACB (T60) and 120 minutes after initial ACB (T120
VAS pain scores during 45 degrees active flexion of the knee
Specification of pain (VAS 0-100 mm) during 45 degrees active flexion of the knee one hour after first and second ACB. Results will be compared between the two groups.
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Time frame: 60 minutes after the initial ACB (T60) and 120 minutes after initial ACB (T120
Sub-group analysis of muscle strength and mobility acconding to baseline VAS during active flexion of the knee prior to the first block
According to their specified VAS (0-100 mm) pain score during active flexion of the knee prior to the first block, patients will be divided into two groups. Group 1 VAS 0-59 mm and group 2 with VAS 60-100 mm. Results within the two groups will be compared: e.g is there a difference in MVIC in the subgroup of patients scoring VAS 0-59 during active knee flexion at baseline? and is this difference larger in the subgroup of patients scoring VAS 60-100?
Time frame: 60 minutes after first ACB (T60)