A teenager has been quizzed by police after a “stupid” YouTube stunt in which a boy was spun at high speed on a park roundabout using the wheel of a moped.
Tyler Broome was left with “horrific injuries” similar to those inflicted by high levels of g-force, his mother said she was told by doctors.
The 11-year-old passed out and was abandoned by those involved, she said.
Nottinghamshire Police said a 16-year-old was interviewed under caution and a moped has been seized.
The teenager was questioned about his involvement over what happened at Ashvale Park, in Tuxford, Nottinghamshire, on Wednesday.
Dawn Hollingworth released a video of son Tyler, which shows him spread-eagled across the top of the roundabout as it spins around.
At the end of the recording, Tyler appears to fall down, his head flopping forward as it comes to a stop.
Blood rushed to his head, causing swelling and bruising to his face, she said.
The 51-year-old said doctors told her Tyler’s injuries were usually seen in fighter pilots suffering the effects of g-force.
Ch Insp Andy Rooke said: “What may have seemed like ‘a bit of fun’ at the time has turned into an incident where an 11-year old boy has received horrific injuries.
“We hope that this incident and the severity of the boy’s injuries serve as a strong warning to anyone thinking about recreating something they have seen online.”
He said Tyler seemed to be “recovering well under the circumstances” and an investigation continues.
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Ms Hollingworth said Tyler was with a group of children, who were attempting to recreate the stunt.
She has warned others not to copy the “silly prank”, which could have had “life-changing consequences” for Tyler.
Mr Rooke added some of the people involved had become “targets of trolls”, who have been sent abusive messages online.
He said: “Messages, once reported, will be investigated and those responsible will be dealt with robustly.”