Patent ID: 9314188
Filing Date: 2016-04-19
CPC Classification: A61B

Claim Text:
1. A system for performing a computer-assisted hip replacement surgery, comprising: a pelvis sensor unit configured to be coupled to a patient's pelvis; a broach sensor unit configured to be coupled to a broach; a femur sensor unit configured to be coupled to the patient's femur; and a computer-readable storage medium having instructions executable, by at least one processing device, (a) which when executed prior to a dislocation of the femur from the pelvis, wherein the pelvis sensor unit is coupled to the pelvis and the femur sensor unit is coupled to the femur, cause the processing device to measure a pre-dislocation positional relationship between the pelvis sensor unit and the femur sensor unit to define a fixed target frame, (b) and which when executed after the dislocation of the femur from the pelvis, wherein the broach sensor unit is coupled to the broach, the femur sensor unit is coupled to the femur, and the broach is inserted within the femur such that positional axes of the broach are collinear or parallel to positional axes of the femur and the coordinate system of the broach matches the coordinate system of the femur, cause the processing device to perform an anatomical registration of the femur to define a femoral coordinate system by measuring, in a single registration measurement, an orientation in three degrees of freedom between the broach sensor unit and the femur sensor unit, (c) and which when executed during a reduction procedure, wherein the pelvis sensor unit is coupled to the pelvis and the femur sensor unit is coupled to the femur, cause the processing device to display the fixed target frame and a track frame, wherein the track frame depicts a reduction orientation between the femur sensor unit and the pelvis sensor unit, and (d) and which when executed after the femur has been positioned such that the track frame matches the target frame, cause the processing device to (1) measure a post-reduction translational distance between the pelvis sensor unit and the femur sensor unit and (2) calculate and display in the femoral coordinate system a change in leg length and a change in offset based on the post-reduction translational distance and the pre-dislocation positional relationship.