A man is recovering in hospital after he was struck by a vehicle then punched, choked and hit with a metal pole in Sydney's southwest.

Emergency services were called to a fire trail at Padstow Heights early on Monday morning, following reports a 55-year-old man had been run over.

Police allege a 40-year-old man attacked the older man with a metal pole while he was pinned underneath the vehicle, then punched him and tried to choke him before running into the national park.

The older man was treated for several injuries before being taken to Liverpool Hospital.

A man was arrested at Milperra yesterday and charged with several assault and traffic offences, as well as breaching bail.

He was refused bail to appear before Bankstown Local Court today.

AAP