| CPC A61B 17/025 (2013.01) [A61B 34/10 (2016.02); A61B 34/20 (2016.02); A61B 90/06 (2016.02); A61F 2/3859 (2013.01); A61F 2/389 (2013.01); A61B 2017/00017 (2013.01); A61B 2017/00221 (2013.01); A61B 2017/00398 (2013.01); A61B 2017/00725 (2013.01); A61B 2017/0268 (2013.01); A61B 2034/104 (2016.02); A61B 2034/105 (2016.02); A61B 2034/2055 (2016.02); A61B 2090/061 (2016.02); A61B 2090/065 (2016.02); A61B 2090/067 (2016.02); A61F 2002/30616 (2013.01); A61F 2/38 (2013.01); A61F 2002/4666 (2013.01); A61F 2002/469 (2013.01); A61F 2002/4692 (2013.01)] | 20 Claims |

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8. A method of performing an arthroplasty procedure of a joint using a computer aided orthopedic surgery system that includes an orthopedic distraction device, a three-dimensional position tracking system, and a computer operatively in communication with the orthopedic distraction device and the three-dimensional position tracking system, comprising:
attaching the orthopedic distraction device to a first bone of a joint before any bone resections of the first bone and a second bone of the joint, the orthopedic distraction device including:
an upper paddle for engaging the second bone, and
a displacement mechanism operable to displace the upper paddle relative to the first bone;
using the orthopedic distraction device, applying a displacement force to displace the upper paddle from the first bone;
using the three-dimensional position tracking system, determining a relative position of the first bone and the second bone upon application of the displacement force; and
using the computer, determining a predicted gap between the first and second bones of the joint based on the relative position of the first bone and the second bone and the displacement force.
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