Muscle perfusion within the zone of injury. Values for each time point were the average reading from the three different laser doppler flowmetry measurement locations. The values at each time point were all normalized by dividing by the average value at baseline. The error bars indicate one standard error of the mean. Statistically significant differences between Contusion and No-Contusion groups are indicated (*, p < 0.01). A borderline statistical difference was found at post-reaming ($, p = 0.05). Statistical differences existed when comparing procedures at each time to baseline only in the Contusion group (#, p < 0.01).