Shipon Ahmed left the five-year-old child in excruciating pain from an injury so bad he looked like a car crash victim, Bradford Crown Court heard.
Ahmed, 39, of Sawery Place, Little Horton, Bradford, claimed the child tripped over a toy and the youngster was too terrified to tell anyone what had happened to him.
Sixteen days before he was tried for causing the child grievous bodily harm with intent, Ahmed glassed a man in the face in the Tequila Nightclub in Chester Street, Bradford.
David Weglewski suffered massive blood loss, arterial damage and numerous lacerations in the attack on the dance floor at 2am on December 5 last year.
He was taken by ambulance to the Major Trauma Ward at Leeds General Infirmary where shards of broken glass were surgically removed from his face.
The court heard that Ahmed attacked Mr Weglewski in a jealous rage after he asked his girlfriend to a party.
Ahmed, a Bangladeshi national illegally in the UK, was remanded in custody charged with a second Section 18 wounding.
He was found guilty of both offences in separate trials at Bradford Crown Court.
He was branded seriously dangerous by Judge Jonathan Durham Hall QC and given an extended sentence of 18 years.
Ahmed was jailed for ten years for breaking the little boy's femur and five years, to run consecutively, for glassing Mr Weglewski.
Judge Durham Hall extended the licence period by three years, telling Ahmed: "You clearly are a very dangerous man."
He was a nasty piece of work who had told lie after lie after lie.
Ahmed had previous convictions for benefit fraud, harassment, and battery on a former partner.
A paediatric doctor said during the first trial that the boy had been swung by his leg, kicked or stamped on.
The judge said the strongest bone in his body had been "cracked and separated, displaced and shattered."
"It was an unbelievable act of brutality. His injuries were comparable to falling from a considerable height or being seriously hurt in a car crash," he told Ahmed.
Judge Durham Hall went on: "You really are not just a man of breathtaking arrogance but you are a very violent person."
Ahmed had sociopathic and psychopathic tendencies.
"You will be deported, I have no doubt. You will be sent back to Bangladesh."