Paper 104: A Simple Radiographic View with a Landmark of an Anterior Femoral Condyle for Determining Rotational Alignment of the Femoral Component in Total Knee Arthroplasty

2012 ◽  
Vol 28 (9) ◽  
pp. e395-e396
Author(s):  
Kazuki Morizane ◽  
Toshiaki Takahashi ◽  
Haruhiko Takeda ◽  
Seiji Watanabe ◽  
Shohei Watanabe ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Femoral Component ◽  
Knee Arthroplasty ◽  
Femoral Condyle ◽  
Rotational Alignment ◽  
Total Knee

Femoral Anterior Tangent Line of the Osteoarthritic Knee for Determining Rotational Alignment of the Femoral Component in Total Knee Arthroplasty

2011 ◽  
Vol 26 (2) ◽  
pp. 268-273 ◽  
Author(s):  
Hiroki Watanabe ◽  
Ryuichi Gejo ◽  
Yoshikazu Matsuda ◽  
Ichiro Tatsumi ◽  
Kazuo Hirakawa ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Femoral Component ◽  
Knee Arthroplasty ◽  
Rotational Alignment ◽  
Tangent Line ◽  
Osteoarthritic Knee ◽  
Total Knee

scholarly journals 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

2021 ◽  
Author(s):  
Arata Nakajima ◽  
Masato Sonobe ◽  
Yorikazu Akatsu ◽  
Manabu Yamada ◽  
Keiichiro Yamamoto ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Femoral Component ◽  
Knee Arthroplasty ◽  
Femoral Condyle ◽  
Young Patients ◽  
Japanese Patients ◽  
Lateral Shift ◽  
Component Size ◽  
Medial Pivot ◽  
Total Knee

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 patients 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 the knee radiographs. 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 for the knee was analyzed. Subjects were classified into three groups according to the femoral component size that was chosen in simulation of TKA.Results: The estimated mean lateral shift of the femoral condyle was 5.99 ± 1.98 mm and was greater in males than females (p < 0.05). Also, it was most highly correlated with the medial proximal tibial angle (MPTA) (r = -0.553, p < 0.01). A group receiving larger component sizes significantly shifted more laterally compared with a group receiving smaller component sizes (p < 0.01). Conclusions: These results suggest that the coronal positional relation between the femur and tibia is altered and subsequent ligament imbalance may occur after mechanically aligned TKA using the medial pivot design.

scholarly journals Which is better? Anterior or posterior referencing for femoral component position in total knee arthroplasty

2021 ◽  
Vol 29 (1) ◽  
pp. 230949902110023
Author(s):  
Sho Nojiri ◽  
Kazue Hayakawa ◽  
Hideki Date ◽  
Yasushi Naito ◽  
Keigo Sato ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Femoral Component ◽  
Knee Arthroplasty ◽  
Femoral Condyle ◽  
Standard Technique ◽  
Component Position ◽  
Intermediate Size ◽  
Total Knee ◽  
Left And Right ◽  
Anterior Posterior

When sizing the femoral component or determining its placement in total knee arthroplasty (TKA), if the anterior–posterior diameter of the femoral condyle is between component sizes, the selected size will differ depending on whether anterior referencing (AR) or posterior referencing (PR) is used. As a result, the amount of resected bone will also vary. In the present prospective study, we compared the two referencing methods to determine which is more suitable for individual patients. We recruited 58 patients (92 joints) who received TKA using the standard technique with intermediate-size components. AR was used in 26 joints, and PR in 23 joints. Seventeen of the patients underwent same-day bilateral TKA in which components of different sizes were used for the left and right joints. AR resulted in significantly smaller anterior and posterior offsets than PR. Preoperative clinical evaluation revealed no significant differences among cases in which intermediate-size components were indicated, or those in which components of different sizes were indicated. When an intermediate-sized component was indicated using the AR method, moving the sizer forward resulted in a larger posterior gap, but this technique was nevertheless considered acceptable. AR is likely to be more suitable than PR as it achieves more physiological anterior clearance.

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