We have carried out a prospective study to determine whether the basic desc
riptive criteria and classifications of diaphyseal fractures of the tibia d
etermine prognosis, as is widely believed. A number of systems which are re
adily available were used, with outcome being determined by standard measur
ements including fracture union, the need for secondary surgery and the inc
idence of infection. Many validated functional outcomes were also used. The
Tscherne classification of closed fractures proved to be slightly more pre
dictive of outcome than the others, but our findings indicate that such sys
tems have little predictive value.