"If you're crippled, you are an outcast. If you're a woman, you can't get married, and if you're a man you can't get a job," notes Dorr.

Operation Walk went to Tanzania for the first time in June. Many people there have little hope for good medical care.

"There is a lot of poverty. There is a lot of discrepency between private medicine," explains Operation Walk surgeon Ammer Malik. He's from Kenya but practices medicine in Spain. "Maybe 85 percent of the population cannot access that kind of medicine."

Dr. Geoffrey Kibira of the Arusha Lutheran Medical Center says some patients in Tanzania were afraid of getting an artifical hip or knee.

"The problem, majority couldn't understand that you can put artifical things in the hip or the knee and walk again," the doctor says. "After seeing some of the patients improving walking and they are pain-free -- now people are coming."

Dorr says he sees change in many of the volunteer doctors and nurses who help patients in developing countries.

"They realize they can do things they didn't even know they can do," he says. "And they can help people even better than they ever thought they could. And it changes them; it changes them for the good."

Dorr adds that for these volunteers, it becomes a calling that gives meaning to their lives.

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