The arithmetic HKA (aHKA) predicts the constitutional alignment of the arthritic knee compared to the normal contralateral knee: a matched-pairs radiographic study

Bone & Joint Open
S J MacdessiDarren B Chen

Abstract

An algorithm to determine the constitutional alignment of the lower limb once arthritic deformity has occurred would be of value when undertaking kinematically aligned total knee arthroplasty (TKA). The purpose of this study was to determine if the arithmetic hip-knee-ankle angle (aHKA) algorithm could estimate the constitutional alignment of the lower limb following development of significant arthritis. A matched-pairs radiological study was undertaken comparing the aHKA of an osteoarthritic knee (aHKA-OA) with the mechanical HKA of the contralateral normal knee (mHKA-N). Patients with Grade 3 or 4 Kellgren-Lawrence tibiofemoral osteoarthritis in an arthritic knee undergoing TKA and Grade 0 or 1 osteoarthritis in the contralateral normal knee were included. The aHKA algorithm subtracts the lateral distal femoral angle (LDFA) from the medial proximal tibial angle (MPTA) measured on standing long leg radiographs. The primary outcome was the mean of the paired differences in the aHKA-OA and mHKA-N. Secondary outcomes included comparison of sex-based differences and capacity of the aHKA to determine the constitutional alignment based on degree of deformity. A total of 51 radiographs met the inclusion criteria. There was no signifi...Continue Reading

References

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Citations

Feb 2, 2021·The Bone & Joint Journal·Samuel J MacDessiDarren B Chen
Dec 29, 2020·Bone & Joint Open·Fares S Haddad
May 4, 2021·The Bone & Joint Journal·Luca BuzzattiThierry Scheerlinck
Jul 22, 2021·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Arun MullajiHarshad Thakur
Jul 23, 2021·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Elliot Sappey-MarinierSébastien Lustig
Sep 27, 2021·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Silvan HessMichael T Hirschmann

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Methods Mentioned

BETA
surgical resection
surgical resections

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