Knee Surg Relat Res 2019 Mar; 31(1): 31-36  https://doi.org/10.5792/ksrr.18.049
Component Alignment in Simultaneous Bilateral versus Unilateral Total Knee Arthroplasty
Irfan Qadir, MBBS, Bahar Shah, MBBS, Muhammad Waqas, FCPS, Umair Ahmad, MBBS, Shahzad Javed, FCPS, and Amer Aziz, FCPS, FRCS
Department of Orthopaedic and Spine Surgery, Ghurki Trust Teaching Hospital, Lahore, Pakistan
Correspondence to: Irfan Qadir, MBBS Department of Orthopaedic and Spine Surgery, Ghurki Trust Teaching Hospital, Jallo Mor, Lahore, Pakistan Tel: +92-300-7321600, Fax: +92-61-6778718 E-mail: irfanqadir88@gmail.com
Received: August 13, 2018; Revised: October 4, 2018; Accepted: October 31, 2018; Published online: March 1, 2019.
© Korean Knee Society. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: The purpose of this study was to investigate differences in component alignment between first and second knees in simultaneous bilateral total knee arthroplasty (SBTKA) and unilateral TKA (UTKA).
Materials and Methods: 274 SBTKAs and 198 UTKAs were included in study. Patients were divided into three groups as SBTKA on the right knee (group A), SBTKA on the left knee (group B) and UTKA (group C). Femoral and tibial component alignment was checked in both coronal plane (alpha [α] and beta [β] angles) and sagittal plane (gamma [γ] and delta [δ] angles) radiographs.
Results: There were no statistically significant differences among groups in the preoperative anatomical varus angle and Kellgren–Lawrence gonarthrosis classification grade (p=0.139 and p=0.329, respectively). In the coronal plane, the alignment of femoral component (α angle) and tibial component (β angle) was similar in all three groups (α angle, 95.01 vs. 95.14 vs. 94.9, p=0.945; β angle, 90.03 vs. 89.67 vs. 89.98, p=0.483). The sagittal plane alignment of femoral component (γ angle) and tibial component (δ angle) did not show significant differences (γ angle, 7.04 vs. 6.98 vs. 7.00, p=0.132; δ angle, 86.56 vs. 87.41 vs. 86.73, p=0.610).
Conclusions: The angular alignment of components was similar between SBTKA and UTKA.
Keywords: Knee, Arthroplasty, Alignment, Position, Component, Simultaneous bilateral


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