The three intruders also stole various personal items.
Police are appealing for information on the assault and robbery which took place around 2.10pm on Tuesday, November 24.
The victim was taken to the Royal Infirmary of Edinburgh for treatment of serious, but not life threatening injuries.
Police are looking for any information on the three suspects.
The first is described as white man, around 5ft 10in tall, of a large build and in his 20s.
The second has been described as white, around 5ft 7in tall with a thin build and in his 30s.
Both men were wearing dark clothing, black beanie hats and black surgical masks.
The third suspect is female and described as white, around 5ft 5in tall with long hip length auburn hair.
At the time of the incident, she was wearing a red and black checked shirt, pink trainers and spoke with a local accent.
Detective Sergeant Keith Taylor, of Edinburgh CID, said: “We are appealing to members of the public who may have seen anyone matching these descriptions around the time of the incident.
“The three suspects headed off in the direction of Iona Street towards Easter Road.
“If you have any CCTV, mobile phone or dashcam footage the could assist with our investigation, please get in touch with officers.
“Police can be contacted by calling 101 and quoting incident number 1641 of Tuesday, 24 November, 2020 or by calling Crimestoppers anonymously on 0800 555 111.”