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. 2024 Mar 30;36(1):14.
doi: 10.1186/s43019-024-00217-6.

Coronal plane alignment of the knee (CPAK) classification and its impact on medial unicompartmental knee arthroplasty: exposing a unexpected external shift of limb mechanical axis in case of prearthritic constitutional valgus alignment: a retrospective radiographic study

Vitantonio Digennaro  1 , Riccardo Ferri  2 , Alessandro Panciera  2 , Barbara Bordini  3 , Davide Cecchin  2 , Lorenzo Benvenuti  2 , Francesco Traina  4 , Cesare Faldini  2
Affiliations

Coronal plane alignment of the knee (CPAK) classification and its impact on medial unicompartmental knee arthroplasty: exposing a unexpected external shift of limb mechanical axis in case of prearthritic constitutional valgus alignment: a retrospective radiographic study

Vitantonio Digennaro et al. Knee Surg Relat Res. .
No abstract available

Keywords: Alignment; CPAK; Knee; LDFA; Unicompartmental; aHKA.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Displacement of limb’s mechanical axis from pre- to postoperative, showing the mean value and range of mHKA and MAD, subdivided in patients with constitutional varus alignment (negative values of aHKA) and constitutional valgus alignment (positive values of aHKA)
Fig. 2
Fig. 2
Displacement of limb’s mechanical axis in long-leg standing radiographs from pre- to postoperative, subdivided in patients with constitutional varus alignment (negative values of aHKA) a, b and constitutional valgus alignment (positive values of aHKA) (c, d). It can be observed that in presence of constitutional varus alignment a, b the limb’s mechanical axis remains internal to the center of the knee despite the recovery of medial compartment height. Conversely, in presence of constitutional valgus alignment (c, d) the limb’s mechanical axis shifts from internal to external, restoring the valgus alignment that was present prior to the OA onset
Fig. 3
Fig. 3
Amount of axial displacement in patients with constitutional valgus alignment compared with those with constitutional varus alignment, assessed using nonparametric Mood’s median tests
See this image and copyright information in PMC

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