The next day he handed himself in to Rotorua police and was charged with careless driving causing injury and failing to stop and ascertain whether anyone was injured.
Martelli, who works as a farm manager in Reporoa, went to Tauranga Hospital to apologise to Alex and paid reparation of $2400 for the cost of the scooter, which was new. He also paid Alex another $2600 to cover medical costs and loss of wages.
Alex started walking without crutches five weeks ago, was due to start casual work at Tect Arena again today and was to head back to the surgeon tomorrow.
He hopes that within a year's time he will be able to return to the level of basketball he was playing before the accident.
Now 17, Alex told the Bay of Plenty Times he had forgiven Martelli.
"Me and him are on pretty good terms. He's done everything right [since the crash]," he said.
In the Tauranga District Court yesterday, Judge Paul Geoghan said once Martelli understood the enormity of his actions he had done everything he could to put things right.
But he described Martelli's decision to leave the scene of the accident as "an appalling error of judgment".
"You have put it down to panic and I can understand that to a degree," he said.
Martelli had not been speeding and Judge Geoghan described his driving as careless rather than reckless or dangerous.
"Just too fast for the conditions," he said.
However, Judge Geoghan said a sense of, "respect and common decency" should have seen Martelli remain at the scene of the life-changing accident.
"This is a situation that's difficulty to impose an appropriate sentence because in respect of the victim nothing can recover what he may have lost," he said.
He asked Martelli if he knew how his victim was recovering and he replied that he was able to walk again.
Judge Geoghan gave Martelli, "very significant credit" for handing himself in to police, for meeting his victim and paying reparation.
He also took Martelli's previously clean record into account.
"I have no doubt that you are in the category of offenders who will not be coming back to the courts," he said.