To investigate whether reducing the volume (30 versus 10 ml) ropivacaine injected can reduce the number of subjects with impaired muscle strength following adductor canal block. We hypothesized that adductor canal block with 10 ml 0.1% ropivacaine preserves quadriceps strength compared with an adductor canal block with 30 ml.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
26
US-guided adductor canal block
Department of Anaesthesia, Centre of Head and Orthopaedics, Copenhagen University Hospital, Rigshospitalet
Copenhagen, Denmark
Number of subjects with reduced quadriceps strength
The difference between the two volumes in number of subjects experiencing a reduction in quadriceps muscle strength by more than 25% from baseline in two consecutive assessments.
Time frame: 0.5 to 6 hours post block
Quadriceps strength in percentage of baseline
The difference between the two volumes in maximum voluntary isometric contraction (MVIC) of the quadriceps muscle, assessed as percentage of the baseline value.
Time frame: 2, 3 and 4 hours post block
Quadriceps strength calculated as AUC
The difference between the two volumes in maximum voluntary isometric contraction (MVIC) of the quadriceps muscle calculated as "area under the curve" (AUC)
Time frame: 30 minutes to 6 hours post block
Modified 30-second Chair Stand test
The difference between the pre block value and the post block value in the modified 30-second Chair Stand test performed on one leg, between the two volumes.
Time frame: 2 and 4 hours post block
VAS pain scores during warmth stimulation
The difference between the two volumes in VAS pain score during warmth stimulation.
Time frame: Mean value for the periode 30 minutes - 6 hours post block
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