Renal or kidney injuries in children are usually minor. A child's kidney is more likely to be injured than an adult's kidney because there is less protection from the bones and muscle around it. The most likely cause of renal injuries is motor vehicle crashes. A hard blow to the upper abdomen or back such as from a fall, sports injury or violent act can cause injury to the kidney or bladder as well. A kidney injury may also result from a gunshot wound or knife wound which tears and cuts the organ. These types of injuries are known as penetrating injuries.
Each person has two kidneys which are located on either side of the spine, behind the intestines and just above the waist. The kidney cleans the blood by filtering out waste materials and getting rid of any water the body doesn't need. The liquid waste made by the kidneys is called urine. The kidneys are part of the renal system. The renal system also includes the ureters, bladder and urethra.
Urine is made in the kidneys and it passes through the ureters. The ureters are small tubes that connect the kidneys to the bladder. The bladder stores the urine. The urine then goes from the bladder through a tube called the urethra to the outside of the body.