Publication: Reliability of the posterior condylar offset
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Date
2022-08
Authors
León Muñoz, Vicente J. ; Parrinello, Andrea ; Galloni, Gianluca ; Lisón Almagro, Alonso J ; López López, Mirian ; Martínez Martínez, Francisco ; Santonja Medina, Fernando
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Publisher
Wiley
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DOI
https://doi.org/10.1002/jor.25205
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info:eu-repo/semantics/article
Description
© 2021 Orthopaedic Research Society. This document is the Published Manuscript version of a Published Work that appeared in final form in Journal of Orthopaedic Research . To access the final edited and published work see https://doi.org/10.1002/jor.25205
Abstract
The posterior condylar offset (PCO) has been proposed as a determinant of a
postoperative range of motion after total knee arthroplasty, although there is no
consensus. This study aimed to demonstrate the error introduced by forcing the
femoral rotation to overlap both condyles for the “true” lateral X‐ray projection for
the PCO measurement. We hypothesize that the angular discrepancy between
the posterior femoral cortical reference plane and the posterior condylar axis plane
due to rotation invalidates the acquisition of reliable measurements on X‐rays. We
have measured the PCO in 50 “true” lateral X‐rays and compared it with the medial
and lateral condyles PCO's assessed on a computed tomography‐scan‐based three‐
dimensional (3D) model of each knee. PCO based on the 3D imaging differed
significantly between the medial (25.8 ± 3.67 mm) and lateral (16.59 ± 2.92 mm)
condyle. Three‐dimensional PCO values differ significantly from those determined in
the radiographic studies. Also, the mean values of the medial and lateral condyle
PCO measurements differed significantly (p < 0.001) with all PCO measurements on
radiographs. We have identified a difference between the posterior cortical plane
and the posterior condylar axis projections, both on the axial plane with a mean
value of 11.23° ± 3.64°. Our data show an interplane discrepancy angle between
the posterior femoral diaphyseal cortical and the posterior condylar axis plane
(due to the femur's necessary rotation to overlap both condyles) may invalidate the
2D X‐ray PCO assessment as a reliable measurement.
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Citation
Journal of Orthopaedic Research , 2022, Vol. 40, Issue 8, pp. 1794-1800
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