The Journal of Bone and Joint Surgery, Vol 76, Issue 3 390-397, Copyright © 1994 by Journal of Bone and Joint Surgery, Inc
The relationship of angulation to translation in fracture deformities
SA Green and P Gibbs
Problem Fracture Service, Rancho Los Amigos Medical Center, Downey, California 90242.
We measured both angulation and translation on anteroposterior and lateral
roentgenograms of 100 fixed post-traumatic deformities (either malunions or
stiff [hypertrophic] non-unions) of long bones. We used trigonometric
formulae to calculate the true planes and actual magnitude of both the
angulation and the transverse translation of each deformity. We found that
the planes of angulation and translation for each osseous deformity were
rotated 43 +/- 25 degrees (mean and standard deviation) with respect to
each other; in fact, we found almost as many instances in which the planes
of angulation and translation of the fragments were within 10 degrees of
perpendicular to each other as we did instances in which the angulation and
translation were within 10 degrees of being in the same plane. Only seven
angular deformities and six translational deformities occurred along either
the sagittal or the coronal plane; the remaining deformities were in planes
that were oblique to the standard reference planes.