Lateral shift of the femoral condyle after total knee arthroplasty: simulation using 2D-templates of the medial pivot design on knee radiographs of young Japanese patients

Autor: Arata Nakajima, Masato Sonobe, Yorikazu Akatsu, Manabu Yamada, Keiichiro Yamamoto, Junya Saito, Masaki Norimoto, Keita Koyama, Shinji Taniguchi, Hiroshi Takahashi, Yasuchika Aoki, Toru Suguro, Koichi Nakagawa
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of Orthopaedic Surgery and Research, Vol 17, Iss 1, Pp 1-8 (2022)
Druh dokumentu: article
ISSN: 1749-799X
DOI: 10.1186/s13018-022-03342-8
Popis: Abstract Background Total knee arthroplasty (TKA) is an established surgical treatment for advanced knee osteoarthritis by which patients can expect improvement of knee pain and function. Although many surgeons have investigated limb alignment after TKA, changes in coronal positional relation between the femur and tibia are not known well. Methods Radiographs of 105 knees of young Japanese patients between 20 and 49 years-old (60 men and 45 women) without osteoarthritic changes who received arthroscopic surgeries at our hospital were used in this study. Using 2D-templates of the medial pivot design (the FINE total knee), we simulated TKA on a SYNAPSE-PACS software. First, the femoral component was placed in normal knee alignment and then was merged to the medial concave of the insert where the tibial component was placed in neutral alignment. The length of the mediolateral shift of the femoral component was measured as an estimate of lateral shift of the femoral condyle, of which association with radiographic parameters including the femorotibial angle (FTA), lateral distal femoral angle (LDFA), and medial proximal tibial angle (MPTA) was analyzed. Subjects were classified into three groups according to the femoral component size that was chosen in simulation of TKA, and the lateral shift of the femoral condyle was compared between groups. Results The estimated mean lateral shift of the femoral condyle was 5.99 ± 1.98 mm and was greater in males than females (p
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