Mystery still surrounds the incident which left a man with puncture injuries on a Forest Town Street.
The 28-year-old was discovered at around 1am on Monday 12th May 2014 in Garibaldi Road, near Garibaldi School.
Detectives think he was injured in Clipstone Road East, near the Crown Farm roundabout, at the entrance to the Garibaldi estate.
He was treated for a puncture wound and was taken to Nottingham’s Queen’s Medical Centre where he has since been discharged.
Detective Sergeant Stuart Temple said: “We take this incident very seriously and we are exploring a number of theories as to how this man sustained his injuries.
“I am appealing to anyone who may have information that could help our investigation to call us.
“Were you walking or driving in the area between midnight and 1am on 12th May? Did you see this man or do have any information about how he sustained his injuries? If so, pick up the phone.”
The man is white and was wearing a blue Ralph Lauren polo shirt, blue jeans and white trainers.
If you saw him or have any information contact police on 101, quoting incident 39 of 12 May 2104, or call Crimestoppers anonymously on 0800 555 111.