Methods for selecting knee prosthesis elements and device therefor
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Abstract
The invention concerns a method for selecting one or several knee prosthesis elements, characterized in that it consists in 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, in processing the data thus obtained to verify whether the HKA angles are substantially equal and included within the tolerable limits, and in processing said 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
34 Claims
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1-17. -17. (canceled)
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18. Method for selecting one or more knee prosthesis elements and, in particular, a prosthetic femoral portion, and/or a tibial prosthetic plate from an available set of these elements, and/or a femoral or tibial thickness template, wherein spatial data concerning the tensioned femoro-tibial spacing and position is acquired with the knee cap in position or dislocated, including the corresponding HKA angle, for at least three angular positions of the knee, namely an intermediate position flexed by approximately 20°
- , and extended position, if possible with 0°
degrees of flexion, and a significantly flexed position, preferably with flexion of approximately 90°
, the information thus obtained, corresponding to the aforementioned position with reduced flexion of 20° and
the extended position, is processed to indicate whether, in these two positions, the HKA angles are substantially equal and are within the tolerable limits of genu varum and of genu valgum, and this data, in particular the data corresponding to the extension and significant flexion of approximately 90°
, is processed, to determine the sizes and/or the positions of the implant and, in particular, the choice of the thickness of the tibial insert for optimum filling of the space between the prosthetic condyle and the tibial cut and the choice of the size of the femoral implant. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
- , and extended position, if possible with 0°
Specification