Patent ID: 7879043
Filing Date: 2011-02-01
Classification: A61B,A61F

Abstract:
1. A method for monitoring impaction of a femoral component of a hip prosthesis into a femur, comprising: receiving impaction data generated during the impaction of the femoral component into the femur from at least one accelerometer attached to the femoral component; normalizing the impaction data into a usable format as normalized impaction data; calculating a total norm of an acceleration signal including the normalized impaction data based on the following equation:  where N is a number of points in a time interval to be analyzed and a is an acceleration measurement taken at an i calculating an impaction monitoring metric E determining a time t(j) corresponding to a fractional value E generating an output based on the time t(j) for the femoral component impaction hit, the output being indicative of the femoral component fit and stability.