Before revision: However this research predates the introduction of hip protector pads in 2011/2012 using modern non-Newtonian materials, such as D3O that absorb around 75% of the impact, typically twice that of previous devices that used soft materials such as textiles or foam pads in an airtight bag, but comparable to the best of the energy-shunting devices, which have now largely disappeared from the market because of a slight tendency to cause pelvic fractures when the energy is transferred Another study showed that hip protectors' design and mechanical properties vary drastically among commercially available hip protectors.
After revision: However this research predates the introduction of hip protector pads in 2011/2012 using modern non-Newtonian materials, such as D3o that absorb around 75% of the impact, typically twice that of previous devices that used soft materials such as textiles or foam pads in an airtight bag, but comparable to the best of the energy-shunting devices, which have now largely disappeared from the market because of a slight tendency to cause pelvic fractures when the energy is transferred Another study showed that hip protectors' design and mechanical properties vary drastically among commercially available hip protectors.