He had graduated with a diploma in Information Technology.

A second spinal surgery was ruled out as it would not help him.

However, Dr Ho found another solution: a small device in the form of a spinal chord stimulator called Medtronic Restore. Two electrical leads were surgically implanted in Mr Mercado's spine and tunnelled under his skin to be attached to a rechargeable battery which was inserted in his abdomen.

"Spinal chord stimulation has been shown conclusively in numerous scientific studies to be able to help patients with failed back surgery syndrome," Dr Ho said.

"The device produces electrical impulses which interrupt pain signals in the spinal cord before they reach the brain. Pain sensation is therefore replaced with a tingling sensation."

Following the procedure, which was done in May last year, Mr Mercado's condition improved. The level of pain he felt in his left leg was reduced by 40 per cent.

With intensive physiotherapy, he soon regained his ability to walk.

"The feeling of being able to stand up and walk on my own was indescribable. I was overwhelmed with joy," he said.

Even though the device does not provide a cure for his condition, Mr Mercado, who now walks with a crutch, is grateful for this second chance at leading a normal life.

He can now indulge in his hobby of cooking and has found a job as an IT support staff member for a government project. "I used to be helped by people but now I am happy to be given this opportunity to help others," he said.

While he cannot participate in sports, he has learnt much from his experience. "I now understand the challenges and discrimination that disabled people face daily," he said. "I have a lot of respect for them."

His mother, who echoes his joy, said: "I am very happy for my son. He has been given a new lease of life."

charkhoo@sph.com.sg

This article was first published in Mind Your Body, The Straits Times.