"One of the patients we talked to said the seats in front of her all collapsed and came at her," she said.
While doctors believe they have only been treating passengers from the crash, Knudson said she suspected some of the patients may have been flight attendants on board. Many patients have yet to be identified.
She commended emergency responders who triaged passengers once they were outside of the aircraft upon the plane's crash landing and said that without their help, she "didn't think they would have survived."
The Crash Investigation
National Transportation Safety Board investigators have recovered the plane's black boxes and they were sent to Washington to be analyzed.
NTSB officials said they hoped to interview the crew later today.
"We went out and looked at the accident aircraft. We have not yet talked to the pilot; we hope to do that in the coming days. But we have obtained the cockpit voice recorder and the flight data recorder, and they have been sent back to our labs in Washington. We hope that there is good data, good information on those, and we'll audition them today back at headquarters," NTSB Chair Deborah Hersman said today on "This Week."
The NTSB is working with Boeing, the Federal Aviation Administration, as well as the Korean Air and Accident Investigation Board to investigate the crash.
"We have a lot of work ahead of us. We have teams that will be looking at aircraft operations, at human performance, survival factors, and we'll be looking at the aircraft. We'll be looking at power plants, systems and structures. And so we really want to make sure we have a good understanding of the facts before we reach any conclusions," Hersman said.
FBI Special Agent in Charge David Johnson said Saturday that "at this point in time, there is no indication of terrorism."
Asiana President Yoon Young-doo said at news conference today that he didn't believe the crash was caused by mechanical failure or pilot error and that it would take time to find out what caused the crash, The Associated Press reported.
A government official involved in the accident investigation told ABC News that so far the airline has been cooperative with the investigation.
The first meeting between accident investigators and Asiana was going on this morning, according to this official.
Meanwhile, local law enforcement officials are working to ensure a smooth return home for passengers who experienced the crash.
San Francisco Sheriff Ross Mirikami said he was coordinating with the Department of Homeland Security and Customs agents to process passengers through customs at the hospital then transport them to the airport so that they were "not further traumatized."
Flight 214's Crash Landing
Flight 214 originated in Shanghai, China, and had a stopover in Seoul, South Korea.
It was carrying 291 passengers, including an infant, plus at least 16 crew members, according to the airline.
An Asiana Airlines official in Seoul told ABC News that 141 Chinese, 77 South Koreans and 61 U.S. citizens were on board.
Vedpal Singh, a passenger who was on Asiana Airlines Flight 214, said he broke his collarbone.
"The moment it touched the runway there was bang and we we realized something has gone wrong, something terrible has happened," Singh said.