Modeling and optimization of correction measures for human extremities

Deformities of the lower extremities can be congenital or post-traumatic. Recent progress in their treatment arises from a new technique based on fully implantable intramedullary limb lengtheners. This allows patient friendly and effective treatment of complex length and rotation deformities. The advancement in technology and growing demands on the precision of a correction require a revision of common operation planning schemes. In this paper, we discuss the questions from computational geometry that arise in semi-automated operation planning based on three-dimensional CT data. We present algorithms for these problems that have been implemented and integrated into a newly developed 3D planning device.