Former president Hosni Mubarak attended a court session on Saturday despite a broken femur sustained during a fall in early July.

The 86-year-old is being retried, along with his two sons and several of aides, on charges of complicity in the killing of about 850 unarmed protesters during the 2011 uprising that ended his 30-year rule.

He was found guilty in conspiring to kill protesters in a verdict of June 2012 and sentenced to life imprisonment, but his conviction was overturned in January 2013 due to procedural failings and a retrial began in April 2013.

Mubarak was transported to court in a helicopter on Saturday and carried behind bars on a stretcher, a regular occurrence during his previous court sessions.

Last August, the ex-president -- who had been detained for nearly two years since shortly after his deposal -- was granted release and placed under house arrest at Cairo's Maadi Hospital.

He was convicted of graft charges in May, and given a three-year jail term, but has not been transferred to prison.

Mubarak's two sons, Alaa and Gamal, are also attending the trial. They were both also convicted of corruption, each receiving a four-year jail sentence.