Kidney bruised person might face long term effects if kidneys are bruised severely. It will depend upon which other parts of the abdominal cavity were injured. The majority kidney bruises never cause permanent and severe effects. On the other hand, if the injury causes scarring that area would no more be able to function.
I have recently had bruised kidneys and so far there are no long term effects but it depends on how badly your kidneys are damaged. You could have a scar that looks like a light green bruise.
First I am not a doctor.see a doctor if you are having problem.most kidney bruises heal on their own. Depending on the severity. Here is a site tat talks about it more. Health.allrefer.com/health/injury-kidney-and-ureter-treatment.html