Same way we treat wounds today, only with more primitive technology and whatever resources were available. The key steps to wound care haven't really changed all that much: 1. Control bleeding 2. Clean the area 3. Close the wound 4. read more
Stone age man had access to relatively clean water (after boiling) to clean wounds. They could apply a variety of naturally abundant plant materials to protect the wound. Many of those plants also had antiseptic properties. read more
These are still factors in the modern era, as well, and we do not have a robust record of mortality figures for Stone Age humans. This is particularly notable because characterizing all people groups as “Stone Age” rather than by era, region, society, class, and position can greatly skew the results of your question. read more