Ian Mellstrom said: "I don't understand how it was possible for the driver not to see a lady with a shopping trolley standing looking across a road.
Joyce Mellstrom (78) was knocked down outside Abbey Court in the town, the car running over her legs twice, shattering the bones and leaving her needing a knee replacement.
"They all gave similar accounts of the car pulling out of Abbey Court and turning right on to Loosing Hill towards Hexham town centre.
When asked why the police had not visited Mrs Mellstrom in hospital, PC Graves said: "Often it's a balancing act between getting the earliest possible recollection of events and taking into account the condition of a patient.
She was knocked down by a silver Peugeot as it left the apartment complex at 11.30am.
It was only after the tourniquet, used to control blood flow in Mrs Mellstrom's leg, was deflated that the speed and strength of her heart rate dramatically declined.
However, the witnesses did not see the collision, and it was not caught on the CCTV cameras in Abbey Court's car park.
The pensioner had left her home at Abbey Court on Loosing Hill, via the vehicle exit with her shopping trolley.
After hearing from pathologist Dr Gemma Kemp that the cause of death was heart failure brought on by complications arising during surgery necessitated by the collision, Mrs Dilks recorded a verdict of accidental death.
Joseph Cosgrove, said in his evidence that Mrs Mellstrom was deemed well enough to undergo surgery and that the one and a half hour operation to replace her knee had been successful.
"Our last condition check suggested there was no urgency and that the injuries were not life threatening."
However, after witnesses recounted seeing the back wheel of the car coming to rest on Mrs Mellstrom's legs, the inquest heard how the driver then moved the vehicle to the other side of the road before the police arrived.
then recall hearing a noise and seeing the shopping trolley fall to the ground."
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When Ian Mellstrom asked whether a tourniquet should have been used on a patient of his mother's age and with her pre existing health conditions, Dr Cosgrove said he knew of no other alternative.
Car ran over pensioner's legs twice
He added that the driver, a care assistant who had been visiting a client, maintained she had not seen Mrs Mellstrom when interviewed under caution and that CCTV footage gave police no concerns over the speed at which the vehicle had been travelling.
Newcastle coroner Karen Dilks heard evidence from PC Alastair Graves who compiled a report on the findings of the police investigation.
He told the hearing that the day Mrs Mellstrom had been knocked down had been dry and bright.
"To the end of my days I will never understand how the driver couldn't see her."
At an inquest into her death held in Newcastle on Monday, her devastated sons, Andrew and Ian, were given the chance to ask questions of the police officers and health professionals Womens Nike Air Vapormax Flyknit Running Shoes who had come into contact with their mother in the days leading up to her death.
Despite drugs, including adrenaline, being administered, Mrs Mellstrom did not respond.
Dr Cosgrove said: "Unfortunately, there are risks associated with any form of surgery where blood flow is precluded to any part of Adidas Prophere On Sale
Mrs Mellstrom, who suffered from angina, high blood pressure and was diabetic, died almost two weeks later, on January 20, after surgery to replace her left knee at Newcastle's Freeman Hospital.
PC Graves said: "No witnesses could be specific about where Mrs Mellstrom was standing; whether she was on the footpath or roadway.
Mrs Mellstrom was taken to Newcastle's RVI for treatment, before being transferred to the Freeman for knee replacement surgery. She died before police could interview her.
PC Graves admitted that efforts to reconstruct exactly what had happened had been hampered by the fact the scene had not been properly preserved.
A police investigation into the incident on January 9, uncovered so little evidence that the Crown Prosecution Service determined no charges could be brought against the 18 year old driver.
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