Here is an interesting article from 2006 about boot-related injuries. It is critical of the USFSA for not investing in research in boot design.

http://www.ocregister.com/sports/-163199--.html

As many as eight out of every 10 elite U.S. skaters suffer boot-related injuries, according to one study, and debilitating hip, knee and back injuries have driven dozens of top prospects out of the sport while still in their mid-teens...

The increase in stress-related injuries can be traced to the elimination of figures from international and national competitions and an emphasis on jumping in the early 1990s. Practice time skaters previously spent perfecting tracing figures in the ice is now spent on landing quadruple jumps by the men, triple jumps by the women.

While figure skating has been revolutionized in the past 15 years by these jumps, the sport's equipment has not kept pace with its athletes...

Some studies estimate that 90 percent of skaters who do triple and quadruple jumps are injured annually, twice the rate for skaters attempting only double jumps.