This might be of some interest:

Health, Grooming and Medicine in the Viking Age

Especially the section on "Battle injuries and first aid", near the bottom. (Emphasis mine)

In chapter 23 of Víga-Glúms saga, Þórarinn was struck by a blow that cut through his shoulder such that his lungs fell out. He was bound up, and Halldóra watched over him until the battle was over. Þórarinn was carried home where his wounds were treated, and over the summer, he recovered.


I may have to reconsider my opinion of hitpoint systems as unrealistic....