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Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy 5/2019

10.07.2018 | Knee

Weight-bearing radiography depends on limb loading

verfasst von: Robert Karl Zahn, Lisa Renner, Carsten Perka, Hagen Hommel

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 5/2019

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Abstract

Purpose

The mechanical axis of the lower limb has shown to vary between different weight-bearing conditions and change after total knee arthroplasty (TKA). The purpose of this study was to investigate the correlation between mechanical axis alignment in standing long-leg radiographs and limb loading after TKA.

Methods

Mechanical axis of the lower limb and limb loading have been prospectively evaluated in 115 patients 10 days and 3 months after TKA. By the moment of standing long-leg radiography for analysis of the mechanical leg axis, two digital scales separately captured the load of each limb.

Results

Mechanical axis changed from an initial − 1° ± 2° valgus alignment to a varus axis of + 1° ± 2° (p < 0.01). This change in alignment was associated with an increase of limb loading from 89.9 ± 10.7 to 93.0 ± 7.0% (p < 0.01). The mechanical axis strongly correlated with relative limb loading at the first and second measurements (r = 0.804, p < 0.001, respectively, r = 0.562, p < 0.001). A significant change in the rate of outliers was registered within the observation period. These alterations and distinctions were much more pronounced in patients with postoperative incomplete extension (n = 15).

Conclusions

The postoperative mechanical axis correlates with limb loading. A clinical relevant change in frontal alignment of the lower limb is associated with increased limb loading after TKA. The actual mechanical axis can only be assessed at physiological limb loading in long-leg radiographs with complete extension at full weight bearing.

Level of evidence

Diagnostic study, Level II.
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Metadaten
Titel
Weight-bearing radiography depends on limb loading
verfasst von
Robert Karl Zahn
Lisa Renner
Carsten Perka
Hagen Hommel
Publikationsdatum
10.07.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 5/2019
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-018-5056-6

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