A jealous jailbird beat a love rival with a coffee table after finding out he had been seeing his former partner while he was locked up.
Peter Hall found out his ex had started a relationship with Andrew Wilson and warned him to end it, which he did.
But the 30-year-old then smashed his way into Mr Wilson's home and launched a savage attack with the piece of furniture, until it was "obliterated".
Newcastle Crown Court heard Mr Wilson was left with a wound to his back which went down to the bone.
Prosecutor Liam O'Brien told the court: "The offence occurred on August 30 last year but the events that led up to the offence occurring began six to eight weeks earlier that that.
"The defendant has an ex partner and after the defendant had been sent to prison, she began a relationship with the complainant in this case, Andrew Wilson.
"It didn't last particularly long, about five to six weeks.
"It ended when the defendant attended Mr Wilson's home and essentially threatened him to stop the relationship.
"Mr Wilson did that. He decided he didn't feel sufficiently strongly about her to have the defendant do anything to him."
The court heard on August 30 Mr Wilson was asleep at home and Hall, who was with another man, was caught on CCTV entering his block of flats.
Mr O'Brien said Hall used "all of his might" to kick through Mr Wilson's front door and added: "That woke Mr Wilson up, he awoke startled and went to see what was going on.
"He saw the defendant. The defendant picked up a coffee table that was in the room and began to strike Mr Wilson repeatedly with it.
"It was a sustained assault that carried on until the coffee table was so severely obliterated it could no longer be used.
"Mr Wilson was left with a deep wound to the back of his left shoulder, deep enough you could see the shoulder blade."
The court heard Mr Wilson had two other, less serious, injuries to his arm and was taken to the Queen Elizabeth Hospital in Gateshead for treatment and given intravenous antibiotics due to the significant risk of infection.
Hall, of Pilgrimsway, Gateshead, who already had a criminal record but not for violence, admitted unlawful wounding.
Recorder Mark McKone sentenced him to 28 months behind bars.
Rachel Hedworth, defending, said the table leg was used in the attack and a lot more took place in the build up to the confrontation.
Miss Hedworth added: "His reaction was utterly disproportionate, it was utterly wrong."
Miss Hedworth said despite Hall's "enhanced status" in prison, he and other inmates are locked up for more than 22 hours per day due to the pandemic.