When a PC suffers one or more serious injury, they have a -1 to all rolls. When they suffer a critical wound they have another cumulative -1 to all rolls. However, all wounds (serious and critical) can be treated fairly easily turning them into stabilized serious wounds.
As I understand it, these stabilized wounds still have narrative effects, and heal as in real life (a sprained ankle could last for 2-4 weeks, other injuries may be permanent).
PCs can have a maximum of four serious injuries. Do stabilized injuries count toward the maximum? I.e. If a PC has an unstabilized serious injury and three old stabilized ones, can they get another serious injury?