A man claiming wrongful assault by police after he was tasered in a pub brawl which also left an officer permanently disabled will have his case proceed to trial.

Robert McLeod is suing the State of WA over his arrest in 2008 after a drunken brawl outside a pub in Joondalup.

Mr McLeod, who has a heart problem, was tasered, prompting his son to launch what has been described as a "flying headbutt" at Constable Matt Butcher.

Constable Butcher suffered serious injuries and is now partially paralysed.

Mr McLeod and his son were charged with assaulting Constable Butcher, but they were found not guilty after a trial in the District Court.

Robert McLeod then launched legal action, claiming battery and wrongful assault.

There had been concerns the state may settle the case, but on Thursday after a pretrial conference, Lindsay Garratt from the WA Police Union said the matter would be going to trial.

"Matt is very appreciative of the strong stance the Government has taken today," Mr Garratt said.

Policeman Mathew Butcher was left partially paralysed after being struck during a brawl outside a Joondalup tavern. ( ABC News: Courtney Bembridge )

"This was an unbelievable incident and Matt's taken a strong stance on it and us as a union will continue to support him in his endeavours."

Robert McLeod was at court today and came face to face with Constable Butcher during the conference.

Outside the court Constable Butcher said he "was fine with it".

"It's just another part of the journey ... and I'm fine with it, it's just another part of the process," he said.

Constable Butcher also said he was pleased the matter was going to trial.

"I stand firm I did nothing wrong on that day, and I'm happy to go to court and go through it again," he said.

"Seven years ago it happened, we just take it in our stride and it's another door to get through and shut and move on."

In 2011 Constable Butcher was awarded $3.3 million by the State Government in what it said was a recognition of the sacrifice all officers make in protecting the public.

Robert McLeod made no comment as he left court.