Hi all,

I have 4*4 transformation matrix of tibia relative to femor for total knee replcement people during a 40frame gait cycle. I found these relative movement of tibia to femor with fluoroscope. I want to achieve the femor relative o tibia transformation matrix. for calculating this matrix I inversed the rotation matrix, and multiplied the 3 translation arrays by -1. However, when I apply the resulted femor relative to tibia transformation matrix to transform the femor on each frame, the femor component does not go the right way relative to tibia component. Could anyoine help me where I make mistake?

I have 4*4 transformation matrix of tibia relative to femor for total knee replcement people during a 40frame gait cycle. I found these relative movement of tibia to femor with fluoroscope. I want to achieve the femor relative o tibia transformation matrix. for calculating this matrix I inversed the rotation matrix, and multiplied the 3 translation arrays by -1. However, when I apply the resulted femor relative to tibia transformation matrix to transform the femor on each frame, the femor component does not go the right way relative to tibia component. Could anyoine help me where I make mistake?

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