The use of computer navigation during hip resurfacing has been proposed to reduce the risk of a malaligned component and notching
with subsequent postoperative femoral neck fracture. Femoral component malalignment and notching have been identified as the
major factors associated with femoral neck fracture after hip resurfacing. We performed 37 hip resurfacing procedures using
an imageless computer navigation system. Preoperatively, we generated a patient-specific computer model of the proximal femur
and planned a target angle for placement of the femoral component in the coronal plane. The mean navigation angle after implantation
(135.5°) correlated with the target stem-shaft angle (135.4°). After implantation, the mean stem-shaft angle of the femoral
component measured by three-dimensional computed tomography (135.1°) correlated with the navigation target stem-shaft angle
(135.4°). The computer navigation system generates a reliable model of the proximal femur. It allows accurate placement of
the femoral component and provides precise measurement of implant alignment during hip resurfacing, thereby reducing the risk
of component malpositioning and femoral neck notching.
Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest,
patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
Each author certifies that his institution has approved the human protocol for this investigation, that all investigations
were conducted in conformity with ethical principles of research, and that informed consent for participation in the study
was obtained.