The study looked at rates of kidney injury in more than 200,000 senior surgical patients in Canada over 14 years.
Acute kidney injury is diagnosed on the basis of clinical history and laboratory data.
It may also be used to describe kidney injury from any single analgesic medication.
Nine cases of kidney injury were also reported.
Last season he missed two games with a serious back and kidney injury.
The ratio may be used to determine the cause of acute kidney injury or dehydration.
Johnson was seriously injured, suffering a broken hip and kidney injuries.
However, a study of 45,000 children with kidney injuries demonstrated no kidney loss in any contact sport.
The one that really hurt him was the kidney injury earlier in the season that caused him to miss two games.