Hello:
The consequences of splenic rupture are generally serious, because true splenic rupture is accompanied by the risk of massive bleeding. General treatment methods include conservative treatment and surgical treatment. The specific treatment method will be determined based on the examination results after the injury.
If it is a splenectomy, there is no risk of another rupture after discharge. If treated conservatively, strenuous exercise or impact injuries may cause spleen rupture. Especially since your grandpa is probably old, he still needs to pay attention to exercise. On the one hand, there is the risk of visceral damage and rupture; on the other hand, due to the gradual osteoporosis of the elderly, there is the risk of fractures. So try not to engage in dangerous sports.
I hope my answer can be helpful to you, thank you.