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Hello from JustAnswer.
I am sorry that you sustained an injury from the assault and battery.
There is no risk of dirt or gravel being able to get into your blood stream from such an injury. The only way that dirt or gravel would be able to get into your blood stream would be if the injury involved much larger veins, and this would not happen from an injury that causes an abrasion of the skin and soft tissue overlying the knees.
Having dirt or gravel in the wound of the skin can increase the risk of infection. And if the abrasion becomes secondarily infected, the germ can spread into the blood stream. But that is why it is important to clean any such wound carefully.
In this case, your description of the healing would indicate that it is not getting infected, and the primary time that it could get infected would be the first week after the injury.
From your description, there is no reason for you to be concerned about any adverse consequences of this injury beyond the effect on the skin and soft tissue.
If I can provide any additional information, please let me know.
The wound care that you have done is fine. This wound is not a risky wound for tetanus, but since it has been over a decade since your last tetanus shot, you are due for another tetanus shot.
Air flow across a wound may be soothing, but it does not really promote or accelerate healing. We typically do not advocate blowing on a wound, but it is more that there is a concern that if you were close enough to the wound, you may get saliva in the wound, and that could be an issue. If you are intentionally doing it from a distance and you find it soothing, then it is fine.
Please let me know if I can provide any further assistance.