A 12-year-old boy has fractured his skull after falling off a spinning seesaw in a Huddersfield park as he played with friends.
Reece Geisler needed 30 stitches and had a blood clot in his brain after hitting his head on a wooden fence when he came off the equipment.
His father said the seesaw was "too close" to the edge of the play area at the Fern Lea park.
Kirklees Council said the condition of the site was "satisfactory".
Reece was taken to Leeds General Infirmary after the accident on 6 May. He had metal plates inserted in his head and underwent three-and-a-half hours of surgery.
His father George said: "It [the seesaw] is extremely close to the edge of the play area.
"Because it's a machine that spins round if anybody fell off it they would not fall straight to the ground, but would probably be thrown straight to one side, as has happened to my son."
A Kirklees Council spokeswoman said: "We are very concerned to hear about the injuries to Reece Geisler and hope that he makes a full recovery.
"Following a visit to the site on Monday, no defects were found with the piece of play equipment or the safety surfacing, and the overall condition of the site was satisfactory."
She added that the equipment had been manufactured and installed to European standards.