ANZIAM J.
44 (2003), 561568

Determining rotational deformity in broken forearms


Abstract

To assess rotational deformity in a broken
forearm, an orthopaedic surgeon needs to
determine the amount of rotation of the radius
from one or more twodimensional xrays of the
fracture. This requires only simple firstyear
university mathematics  rotational
transformations of ellipses plus a little
differential calculus  which yields a general
formula giving the rotation angle from
information obtained from an xray. Preliminary
comparisons with experimental results are
excellent. This is a practical problem that
may be useful to motivate the teaching of conic
sections.

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