2023 ISAKOS Biennial Congress ePoster
Three-Dimensional Evaluation of Distal Femoral Valgus Angle Using Whole Leg CT in Total Knee Arthroplasty
Atsushi Sato, MD, PhD, Koto-Ku, Tokyo JAPAN
Jun Oike, MD,PhD, Koto, Tokyo JAPAN
Masataka Ota, MD, Tokyo JAPAN
Kanako Izukashi, MD, Yokohama, Kanagawa JAPAN
Saki Yagura, MD, Kawasakishi Miyamaeku, Kanagawa JAPAN
Takayuki Okumo, MD, PhD, Tokyo, Tokyo JAPAN
Naoki Okuma, MD, Yokohama, Kanagawa JAPAN
Takayuki Koya, MD, PhD, Chicago, IL UNITED STATES
Fumiyoshi Kawashima, MD, Tokyo JAPAN
Hiroshi Takagi, MD, PhD, Tokyo JAPAN
Koji Kanzaki, Prof., Yokohama JAPAN
Department of Orthopedic Surgery, Showa University Koto Toyosu Hospital, Koto-ku, Tokyo, JAPAN
FDA Status Not Applicable
Summary
Distal Femoral Valgus Angle using whole leg 3D-CT varies in each patient in Total Knee Arthroplasty
ePosters will be available shortly before Congress
Abstract
Introduction
Proper implant positioning is important to get suitable leg alignment in total knee arthroplasty (TKA). However, the three-dimensional evaluation of accurate lower limb alignment is still controversial.
Purpose
Therefore, we performed a three-dimensional evaluation of the distal femoral valgus angle (DFVA) using full-leg CT before TKA.
Methods
Consecutive 296 patients (169 females, 48 males, mean age: 75.4 y.o), yielded 296 knees were included in this study. CT-based patient-specific 3D femur model by ZedKnee software (LEXI) was used to define a mechanical axis and distal anatomical axis of the femur. The case where the angle deviates from the DFVA by ± 3 ° was defined as the outlier, and the ratio of the outlier was evaluated.
Results
The average DFVA was 6.2 ± 2.2 °, of which outliers were found in 53 knees (17.9%). Of the outliers, 22 (7.6%) had DFVA less than 3 ° and 31 (10.5%) had greater than 9 °.
Conclusion
It should be noted that the same cutting angle for performing the distal femoral bone cut in TKA may lead to improper placement of the femoral component.