A new internal fixation concept for the distal femoral fracture after total knee arthroplasty

作者：Chen CM; Yang CT; Wei HW; Liau JJ; Cheng CK^*

来源：Journal of the Chinese Institute of Engineers, 2003, 26(6): 803-808.

DOI：10.1080/02533839.2003.9670834

• internal fixation
• supracondylar femoral fracture
• total knee arthroplasty
• biomechanical test

A new internal fixation concept for the supracondylar femoral fracture after total knee arthroplasty (TKA) was investigated. In the new design, the intramedullary nail was fixed on the modified femoral component of the total knee prosthesis by a locking screw. The new internal fixator complex should have greater structural stiffness by increasing the structure contact area between bone and implant. To test this improvement, biomechanical tests were conducted to compare the mechanical properties (axial and torsional stiffness) of the fractured femurs that were stabilized by three different fixators (DCS plate, GSH nail and new design fixator). The compressive test and torsional test were done by the NITS Bionix858 to compare the mechanical stability of these fixators. The results showed no significant difference among groups in compressive stiffness, which meant that these three fixators could stabilize the fracture effectively in the longitudinal direction. The torsional stiffness of all three fixation groups were lower than the Intact group with significant difference. But the torsional stiffness of the new designed fixator was higher than the DCS plate and the GSH nail. The results supported the new design concept's practicality. The new design also has better initial stability in the fixation of a supracondylar femoral fracture after TKA.

• 出版日期2003-11