The Validity of a New Low-Dose Stereoradiography System to Perform 2D and 3D Knee Prosthetic Alignment Measurements

PloS One
Marrigje F MeijerInge H F Reininga

Abstract

The EOS stereoradiography system has shown to provide reliable varus/valgus (VV) measurements of the lower limb in 2D (VV2D) and 3D (VV3D) after total knee arthroplasty (TKA). Validity of these measurements has not been investigated yet, therefore the purpose of this study was to determine validity of EOS VV2D and VV3D. EOS images were made of a lower limb phantom containing a knee prosthesis, while varying VV angle from 15° varus to 15° valgus and flexion angle from 0° to 20°, and changing rotation from 20° internal to 20° external rotation. Differences between the actual VV position of the lower limb phantom and its position as measured on EOS 2D and 3D images were investigated. Rotation, flexion or VV angle alone had no major impact on VV2D or VV3D. Combination of VV angle and rotation with full extension did not show major differences in VV2D measurements either. Combination of flexion and rotation with a neutral VV angle showed variation of up to 7.4° for VV2D; maximum variation for VV3D was only 1.5°. A combination of the three variables showed an even greater distortion of VV2D, while VV3D stayed relatively constant. Maximum measurement difference between preset VV angle and VV2D was 9.8°, while the difference with VV3D ...Continue Reading

References

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Citations

Feb 26, 2016·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Marrigje F MeijerMartin Stevens
May 23, 2018·International Journal of Computer Assisted Radiology and Surgery·Guoyan ZhengGeert Peersman
Oct 2, 2021·Archives of Orthopaedic and Trauma Surgery·Marc-Daniel AhrendFelix Finger

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Software Mentioned

SterEOS
VV2D
SPSS Statistics
VV3D

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