Methods for selecting knee prosthesis elements and device therefor
First Claim
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1. A method for selecting one or more knee prosthesis elements, comprising:
- tensioning femoro-tibial spacing and acquiring with acquiring means spatial data concerning the tensioned femore-tibial spacing and position with a knee cap in position or dislocated, including a corresponding HKA angle, for at least three angular positions of the knee, including an intermediate position, an extended position if possible with 0°
degrees of flexion, and a significantly flexed position;
processing with determining means the data thus obtained, corresponding to the intermediate position and the extended position, to indicate whether, in these two positions, the HKA angles are substantially equal and are within tolerable limits of genu varum and of genu valgum; and
processing with processing means the data corresponding to the extension and significant flexion to determine sizes and/or positions of an implant and, or a choice of a thickness of a tibial insert for optimum filling of a space between a prosthetic condyle and a tibial cut or a choice of the size of a femoral implant.
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Abstract
Method for selecting one or several knee prosthesis elements, by acquiring spatial data concerning spacing and tensioned femorotibial position, including the corresponding HKA angle, for at least three angular positions, of 20°, of 0°, and of the order of 90° in flexion, processing the data thus obtained to verify whether the HKA angles are substantially equal and included within the tolerable limits, and processing the data, in particular those corresponding to extension and flexion of 90° to determine the dimensions and/or positions of the implant.
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Citations
14 Claims
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1. A method for selecting one or more knee prosthesis elements, comprising:
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tensioning femoro-tibial spacing and acquiring with acquiring means spatial data concerning the tensioned femore-tibial spacing and position with a knee cap in position or dislocated, including a corresponding HKA angle, for at least three angular positions of the knee, including an intermediate position, an extended position if possible with 0°
degrees of flexion, and a significantly flexed position;processing with determining means the data thus obtained, corresponding to the intermediate position and the extended position, to indicate whether, in these two positions, the HKA angles are substantially equal and are within tolerable limits of genu varum and of genu valgum; and processing with processing means the data corresponding to the extension and significant flexion to determine sizes and/or positions of an implant and, or a choice of a thickness of a tibial insert for optimum filling of a space between a prosthetic condyle and a tibial cut or a choice of the size of a femoral implant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification