The Allegheny County Sheriff's Office on Wednesday was not identifying the deputy or the juvenile, because charges against minors are usually not public record.
But according to a news release, the incident happened about 12:30 p.m. Tuesday after a judge ordered the boy confined in the county-run Shuman Juvenile Detention Center.
That's when the boy ran out of the courtroom and down the main stairwell at the county's Family Law Center in downtown Pittsburgh.
The deputy tackled the youth and was knocked unconscious when his head hit a wall. The youth was not injured.
The deputy was revived by other at the scene, then treated and released from UPMC Mercy hospital.