Kidney contusion is an injury to one or both kidneys caused by blunt force without directly destroying tissue in the organ. The kidney contusion is counted among the kidney traumas, in whose classification of grade 1-5 it corresponds to grade 1. Kidney contusion, also known as renal contusion, is defined as a bruise (hematoma) that is located within the connective tissue capsule surrounding the kidney and does not expand further over time.
The functional kidney tissue is only displaced, but not damaged. This is different in the case of a higher order renal trauma. About two thirds of the kidney injuries recorded are classified as grade 1.
Kidney trauma grade 2, in which a spreading hematoma develops, and grade 3, like kidney contusion, are usually still treated conservatively. Kidney trauma grade 4 and 5 can have severe injuries of the kidneys and the urinary tract. In these cases, part of the functional tissue of the kidneys may be destroyed, and the urinary tract may be affected or even completely torn off.
This must be treated surgically. Kidney contusions, on the other hand, are usually well healing, but should be clarified by a physician to rule out a more serious finding. Most kidney bruises are caused by sports or traffic accidents, but physical injuries are also a possible cause.
Why should a kidney contusion be seen by the doctor?
The kidneys, of which humans usually have two, are among the most important organs of the body. They are located on both sides of the spine, approximately below the navel line. In addition to producing urine and thus maintaining the water balance in the body, the kidneys have other important tasks.
It uses the urine to filter dangerous toxins, which the body cannot break down, from the blood and excretes them. It also ensures that the correct proportions of salts (electrolytes) dissolved in the blood are maintained. In addition, the kidney regulates blood pressure to a great extent and ensures the correct adjustment of the pH value, which must be kept within narrow limits.
Hormones are also produced by the kidneys. Because of this diversity, an injury to one or both kidneys can have consequences that should not be underestimated, depending on their severity. A kidney contusion, however, does not lead to the destruction of kidney tissue and thus the function is maintained. Nevertheless, a contusion of the kidney should be treated and if it is suspected, it is essential to see a doctor, since the extent of the injury cannot be estimated at this time. Not only the kidney may have been affected, but also neighboring organs or bones.