An external fixator has been designed that is rigid enough to eliminate the need 
for skeletal traction in patients with unstable pelvic-ring fractures. This 
Wichita frame is similar to the Pittsburgh frame but is stiffened by the use of 
locked crossbars connecting the side triangles. The frame was tested in 
cadaveric specimens by techniques previously reported. In addition, 
finite-element modeling of the various frame designs was performed to ensure 
that the frame configuration was optimal and to supplement in vitro test 
results. Multiple variables that can influence frame failure loads were 
examined.