Our Casey Bortnick tells us about a new knee replacement surgery.

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"It was more of a stabbing pain," said Tanya Welch.

Sometimes, pain killers just aren't enough.

"I did the therapy and I did the physical therapy and I did the oil shots. Everything. And this was the last resort," Welch said.

Welch has major joint damage in her right knee.

"It was just bone rubbing on bone," Welch said.

A perfect candidate for a total knee replacement, Welch was measured for her implants before surgery.

"If you look at the actual model that was made of her knee, you can see it fits seamlessly," said Dr. John Klibanoff, an orthopedic surgeon.

Called jigs, these tools were custom designed by mapping Welch's knee through an MRI instead of on the operating table. Not only does that save time...

"The end of the bone is now shaped to match the implant," Kilbanoff said.

Doctors say it also improve the results.

"I am convinced that with improved alignment, and this technique does allow improved alignment, on a reproducible basis, that the joints will last longer," Klibanoff said.

Welch's implants were in place in under an hour.

"It allows for excellent flexion and full extension of the knee," Klibanoff said.

Less than a month after surgery, Welch is back on her feet.

"Surgery was Monday and they had you on physical therapy by Tuesday," Welch said.

As soon as her right knee is healed, she wants to do the left one. She says her motivation is simple.

"Can you fix it? Fix it. Why should I suffer when it can be fixed? And that was my motto," Welch said.