Six tibias removed from 30-40 years old males

who died in an accident for in less than 12 hours

were osteotomized at one-third supra-medium segment. They were fixed by an unilateral adjustable external fixer （UAEF）

to be used as a model of external fixation of tibial fracture （MEFTF）. The compression. tension

torsion

antero-posterior and lateral bending strength

and the strength for vertically extracting the pins from the tibia were determined in the MEFTF. Within a certain range of load

the correlation of strain to stress was basically a linear relationship. These data provide a theoretical basis of biomechanics for the improvement of UAEF and for early exercises of fracture patients

such as extend-bending of the joint.raising the limb and walking with a walking stick.