Because when you grill meat, the fat drains away from the meat. When you cook your patty in a frying pan, the meat sits in fat and absorbs much of it. Try it topless. Most hamburger buns can add calories, fat and refined carbohydrates to your meal.
1 For the initial diagnosis of kidney stones, ultrasounds may be a better choice than CT scans, a new study has found. Both techniques may be effective, but CT scans are more expensive and deliver a large dose of radiation.
You would need to have an imaging study of your kidney to detect a bruise (like a CT scan or an ultrasound). I am not suggesting you do this because even if there is a bruise to the kidney (and I doubt there is) there would be no special intervention if pain was the only problem.