The purpose of this study is to investigate whether dexamethasone as an adjuvant to ropivacaine for adductor canal block increases duration of the sensory block, when controlling for a systemic effect using a paired design and bilateral blocks. The investigators hypothesize that adding dexamethasone to ropivacaine will prolong block duration compared with ropivacaine + placebo.
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Difference in duration of sensory block between dexamethasone and placebo assessed as cold sensation with an alcohol swab
Timeframe: 0-36 hours