The mum-of-three endured around five years of pain and had eight operations to recover from the injury.
“The relief is still immense,” she said.
Alison had damaged her knee so much it had crumbled and disappeared. Doctors said she would need a knee replacement, which would then need to be changed every 10 years.
But instead she had the pioneering new treatment in which medics harvested cells from above the damaged knee and sent them to a lab in Copenhagen to grow her a new knee cap.
Now she will be pain-free for the next 15 years - although it will require further treatment in time.
Two years on from the major surgery, she has completed a 26.2 mile night-walk with colleagues from Taylor Made Solutions in Fareham.
“When I crossed the finish line I genuinely couldn’t believe I’d done it,” said Alison, 44.
“I didn’t know five years ago, or even two years ago, what was going to happen to me.
“I couldn’t walk around the Co-op in the Locks Heath Centre. To not be able to function on a day-to-day basis was a situation I hoped I wasn’t going to stay in.”
But she has had a remarkable recovery from the operation, which has a success rate of 75 per cent.
“It’s fascinating technology,” she added. “They took a sample from my leg that wasn’t damaged, sent it to Denmark to grow and replanted it into my knee. Then glued and stapled it back up.”
Alison laughed: “My knee looked like a road map of Great Britain.”
The marathon-walking team of five, all from the Western Wards area, walked across London with thousands of others to raise money for Cancer Research UK.
They crossed the Shine Walk finish line at 5.40am, completing it in nine hours and 11 minutes. They have raised more than £3,200 for the charity and hope to increase the total to £3,500.
She said she saw the marathon as a personal challenge to overcome her ordeal as well as raise money “for a fantastic charity”.
“People have been really generous,” she said. “I’m pretty confident it shows I’m recovered. My feet were throbbing afterwards, but my knee was absolutely brilliant throughout the walk.
“It was an amazing experience and something everyone should do!
“I’m sending a photo of me crossing the finish line to my surgeon because without him I wouldn’t have been able to do it.”
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