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Knee Surgery, Sports Traumatology, Arthroscopy

Published in:

22-03-2023 | Osteoarthrosis | KNEE

The coronal plane alignment of the knee classification does not correlate with the functional knee phenotype classification

Authors: Jean-Yves Jenny, Florent Baldairon

Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 9/2023

Abstract

Purpose

It is now well established that the coronal anatomy of the lower limb is highly variable both in non-arthritic subjects and subjects undergoing total knee arthroplasty (TKA). Two new classifications were recently described independently, but never compared: functional knee phenotypes classification and coronal plane alignment of the knee (CPAK) classification. The hypothesis of this study was that there was a significant difference between the values of the hip–knee–ankle angle (HKA) and the arithmetic hip–knee–ankle angle (aHKA) measures in the same patient at the time of TKA.

Methods

Five hundred and twenty cases were randomly selected among patients operated on for a TKA with navigation assistance. Anatomical parameters were collected during surgery by a navigation system, and the corresponding data of the CPAK classification were calculated. The numerical values of measured HKA and aHKA in the same patient were compared.

Results

The measured HKA had a mean of 3.0° varus (standard deviation of 6.0°). The calculated aHKA had a mean of 1.8° varus (standard deviation 4.8°). There was a significant difference between the values of the two measurements in the same subject (p = 0.005) and a weak negative correlation between the values of the two measurements in the same subject. In addition, there was no relationship between HKA values and joint line obliquity values or CPAK class.

Conclusion

A significant difference and a weak correlation between the values of the HKA and aHKA measures in the same subject were observed. The two analysis techniques used provide different information, and their correlation is only partial. These two techniques therefore appear to be complementary rather than exclusive. The clinical relevance of using these techniques during TKA remains unknown.

Level of evidence

III.

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Title: The coronal plane alignment of the knee classification does not correlate with the functional knee phenotype classification
Authors: Jean-Yves Jenny
Florent Baldairon
Publication date: 22-03-2023
Publisher: Springer Berlin Heidelberg
Keywords: Osteoarthrosis
Osteoarthrosis
Published in: Knee Surgery, Sports Traumatology, Arthroscopy / Issue 9/2023
Print ISSN: 0942-2056
Electronic ISSN: 1433-7347
DOI: https://doi.org/10.1007/s00167-023-07394-z

Keynote webinar | Spotlight on medication adherence

Springer Medicine

The coronal plane alignment of the knee classification does not correlate with the functional knee phenotype classification

Abstract

Purpose

Methods

Results

Conclusion

Level of evidence

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

Level of evidence

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