Adductor canal block versus femoral nerve block and quadriceps strength: A randomized, double-blind, placebo-controlled, crossover study in healthy volunteers

Pia Jæger*, Zbigniew J.K. Nielsen, Maria H. Henningsen, Karen Lisa Hilsted, Ole Mathiesen, Jørgen B. Dahl

*Corresponding author af dette arbejde

    Publikation: Bidrag til tidsskriftArtikelForskningpeer review

    Abstrakt

    Background: The authors hypothesized that the adductor canal block (ACB), a predominant sensory blockade, reduces quadriceps strength compared with placebo (primary endpoint, area under the curve, 0.5-6 h), but less than the femoral nerve block (FNB; secondary endpoint). Other secondary endpoints were adductor strength and ability to ambulate. Methods: The authors enrolled healthy young men into this double blind, placebo-controlled, randomized, crossover study. On two separate study days, subjects received either ACB or FNB with ropivacaine, and placebo in the opposite limb. Strength was assessed as maximum voluntary isometric contraction for quadriceps and adductor muscles. In addition, subjects performed three standardized ambulation tests. Clinicaltrials.gov Identifier: NCT01449097. Results: Twelve subjects were randomized, 11 analyzed. Quadriceps strength (area under the curve, 0.5-6 h) was significantly reduced when comparing ACB with placebo (5.0 ± 1.0 vs. 5.9 ± 0.6, P = 0.02, CI:-1.5 to-0.2), FNB with placebo (P = 0.0004), and when comparing FNB with ACB (P = 0.002). The mean reduction from baseline was 8% with ACB and 49% with FNB. The only statistically significant difference in adductor strength was between placebo and FNB (P = 0.007). Performance in all mobilization tests was reduced after an FNB compared with an ACB (P < 0.05). Conclusions: As compared with placebo ACB statistically significantly reduced quadriceps strength, but the reduction was only 8% from baseline. ACB preserved quadriceps strength and ability to ambulate better than FNB did. Future studies are needed to compare the analgesic effect of the ACB with the FNB in a clinical setting.

    OriginalsprogEngelsk
    Sider (fra-til)409-415
    Antal sider7
    TidsskriftAnesthesiology
    Vol/bind118
    Udgave nummer2
    DOI
    StatusUdgivet - 1 feb. 2013

    Fingeraftryk

    Udforsk hvilke forskningsemner 'Adductor canal block versus femoral nerve block and quadriceps strength: A randomized, double-blind, placebo-controlled, crossover study in healthy volunteers' indeholder.

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