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MICCAI
2001
Springer

Repeatability and Accuracy of Ankle Centre Location Estimates Using a Biaxial Joint Model

12 years 23 days ago
Repeatability and Accuracy of Ankle Centre Location Estimates Using a Biaxial Joint Model
In conventional total knee replacement (TKR) surgery, a significant fraction of implants have varus/valgus alignment errors large enough to reduce the lifespan of the implant, so we are developing a more accurate computerassisted procedure aimed at reducing the standard deviation (SD) of the implant procedure. In this study we introduce a new method of locating the ankle joint centre (AJC) using a biaxial model (BM), and determine the accuracy and repeatability of this protocol compared to a digitization method and a spherefitting method used in a current computer-assisted procedure. Repeated in vivo measurements performed by a single operator were obtained from five normal subjects (450 measurements) using the three methods of AJC location. Based on these experiments we estimate the varus/valgus SD of defining the tibial mechanical axis in the frontal plane for the tested population to be 0.28° for the spherical model, 0.17° for the biaxial model, and 0.11° for the conventional dig...
Cameron A. Shute, Antony J. Hodgson
Added 30 Jul 2010
Updated 30 Jul 2010
Type Conference
Year 2001
Where MICCAI
Authors Cameron A. Shute, Antony J. Hodgson
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