SYMPOSIA PAPER Published: 01 January 1989

Modeling the Insertion of a Zickel Rod into the Femur


A computer-aided design (CAD) system was used to model the insertion of a Zickel rod into a femur. Results show that although the shape of the rod and the intramedullary canal match closely in the fully inserted position, a considerable geometric mismatch can occur during rod insertion. The location of the starting hole and the valgus bend at the proximal end of the rod shaft can combine to create high stresses in the trochanteric region. High stresses can also occur during insertion between the canal and the distal posterior rod surface. These phenomena are the likely causes of the intraoperative complications of trochanteric fracture and the difficulty experienced in readjusting the anteversion once a rod has been inserted. Redesign of the distal end of the rod could reduce the difficulty in readjusting the anteversion.

Author Information

Hoffman, AH
Worcester Polytechnic Institute, Worcester, MA
Daly, A-M
Worcester Polytechnic Institute, Worcester, MA
Olivieri, SA
Worcester Polytechnic Institute, Worcester, MA
Tarquinio, TA
Saint Vincent Hospital, Worcester, MA
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Developed by Committee: F04
Pages: 34–43
DOI: 10.1520/STP10365S
ISBN-EB: 978-0-8031-5073-7
ISBN-13: 978-0-8031-1181-3