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Systems and methods for providing alignment in total knee arthroplasty

  • US 9,597,096 B2
  • Filed: 03/17/2014
  • Issued: 03/21/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A system for optimizing the alignment of a bone cutting guide for placement of a total knee prosthesis component comprising:

  • a first bone sensor having a sensor for determining the orientation of the first bone sensor and a transmitter for transmitting orientation data wirelessly, the first bone sensor being adapted to be fixed to a first bone;

    a first bone guide having a plurality of probes configured to contact anatomical features of the first bone to establish a known geometry with respect to a mechanical axis of the first bone, the first bone guide including a first bone guide sensor having a sensor determining the orientation of the first bone guide and a transmitter for transmitting orientation data wirelessly;

    a first bone cutting guide having one or more features configured for attactment to the patient'"'"'s anatomy proximate to the first bone, the first bone cutting guide including a first bone cutting guide sensor having a sensor determining the orientation of the first bone cutting guide and a transmitter for transmitting orientation data wirelessly;

    a second bone sensor having a sensor for determining the orientation of the second bone sensor and a transmitter for transmitting orientation data wirelessly, the second bone sensor being adapted to be fixed to a second bone;

    a second bone guide having a plurality of probes configured to contact anatomical features of the second bone to establish a known geometry with respect to a mechanical axis of the second bone, the second bone guide including a second bone guide sensor having a sensor determining the orientation of the second bone guide and a transmitter for transmitting orientation data wirelessly;

    a second bone cutting guide having one or more features configured for attachment to the patient'"'"'s anatomy proximate to the second bone, the second bone cutting guide including a second bone cutting guide sensor having a sensor determining the orientation of the second bone cutting guide and a transmitter for transmitting orientation data wirelessly; and

    a processing unit comprising a computer processor coupled to a non-transitory memory and a display, the memory storing software instructions causing the computer processor to;

    i) receive orientation data wirelessly from the first bone sensor;

    ii) receive orientation data wirelessly from the first bone guide sensor;

    iii) apply the orientation data from the first bone guide sensor and the first bone sensor to calculate angular offsets that calibrate the first bone sensor'"'"'s orientation data to reflect the orientation of the mechanical axis of the first bone;

    iv) receive orientation data wirelessly from the first bone cutting guide sensor;

    v) display to a user a difference between the orientation of the mechanical axis of the first bone and the orientation of the first bone cutting guide;

    vi) receive orientation data wirelessly from the second bone sensor;

    vii) receive orientation data wirelessly from the second bone guide sensor;

    viii) apply the orientation data from the second bone guide sensor and the second bone sensor to calculate angular offsets that calibrate the second bone sensor'"'"'s orientation data to reflect the orientation of the mechanical axis of the second bone;

    ix) receive orientation data wirelessly from the second bone cutting guide sensor; and

    x) display to a user a difference between the orientation of the mechanism axis of the second bone and the orientation of the second bone cutting guide.

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