Sam suffered what doctors thought were fatal injuries after a collision with a car while riding his pushbike in Rutherford on May 6.

So severe were his injuries, doctors told his loved ones he wouldn't survive and if he did, he'd likely never walk or talk again.

How wrong they were.

"I had three angels in heaven with me that day - my two grandmothers and my mum - and another one holding my hand on the side of the road," Sam said.

After 14 weeks in hospital, Sam has returned to his Rutherford home and has finally met his roadside angel Kathy Keen.

Kathy was driving past just seconds after the accident and knew what she saw was dire.

"I had to stop," said the disability support worker.

"I have first aid and I knew I had to try to help Sam," she said.

Kathy stayed by Sam's side reassuring him until an Ambulance arrived.

"I could see how severe his head injuries were and I seriously didn't think he was going to make it.

"Sam had no idea who he was, where he was or what had happened. He kept crouching down in a ball and I got him to calm down, sit quietly and helped him from further injuring his body.

"I gently stroked his back and assured him the ambos were coming.

"He didn't want anyone else near him and abused anyone who approached us.

"His ear - it was shocking, hanging on by a thread and he had blood clots coming out of his nose - I knew he had a massive head injury."

After Sam was transported to Maitland Hospital and later airlifted to John Hunter, Kathy spent months wondering what happened to him.

"I put a random post up on a community Facebook page to ask if anyone knew how the guy was who was riding a bike and collided with a car in Arthur Street, Rutherford. I drove past the site and I'd wonder what became of him," Kathy said.

"I was shocked when Sam replied to the post and said 'that was me'. He'd only been discharged from hospital a day or so before."

Sam said he can't remember anything about the accident.

Chief Inspector Tony Townsend, of Maitland Police, said no one has been charged in relation to the matter.

Sam sustained a broken back, two broken vertebrae, a broken neck and sternum, four skull fractures, multiple facial fractures and a brain bleed.

He was in a coma for six weeks.

"I came out of the coma and started to make a joke to my aunty about a few things and I think she realised then that I was going to be all right," Sam said.

"I was in John Hunter Hospital for a long time and the staff there were fantastic to me - even when I'd get mad or frustrated about a few things."

Sam had to undergo weeks of rehabilitation including learning how to walk again which he has done with great gusto. "My hand writing is still a bit of a mess but I can't really complain - I'm still here," he said.

Sam is positive about his future and looking ahead to study music production. He is walking every day, attending physio sessions and being active carrying out household jobs.

He has lost most of the hearing in his left ear which was partially severed during the accident and his balance is slightly askew.

Sam said he can't thank Kathy enough for what she did for him on the day of his accident.

"I seriously think the world of her - for someone to stop and help a stranger who is seriously hurt and in a bad way - there just should be more people in the world like Kathy," Sam said.

"From the bottom of my heart I say thank you for keeping me still and calm and making sure everyone who came up to me at the scene left me alone - what a kind, kind heart."

Kathy, of Metford, said she was so overwhelmed with the response to her Facebook post. "There were more than 350 people who reacted to the post and Sam's comment," she said.

"I thought what a response from a wonderful supportive community - many who know Sam. It renewed my faith in humanity and it gives me goosebumps and makes my eyes well up every time I think of it. The support from that community is just wonderful. This is such a feel good story and it's so lovely we have connected."