Effect of nerve block on quadriceps muscle strength, as measured by isometric dynamometer during maximal isometric contraction. The mean and SD of the percentage of maximal voluntary isometric contraction (MVIC) preserved is examined up to 1 h postblock. Apart from baseline, the difference is statistically significant (P < 0.00001) at all time points (Bonferroni–Holm correction). ACB = adductor canal block; FNB = femoral nerve block.