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Abstract
Purpose
To determine the most reliable reference axis for the femoral component rotation in TKA patients by comparing the trochlear anterior line (TAL) and the femoral anterior tangent line (FAT). To evaluate the variability of each anatomic parameter in a Korean population.
Methods
Magnetic resonance images (MRIs) were taken for 500 patients (400 females and 100 males) with knee joint osteoarthritis who had Kellgren and Lawrence grade 3 and 4 prior to TKA in our institution between February 2016 and September 2017. It was investigated that whether significant differences in variance and gender exist for TAL and FAT.
Results
TAL and the FAT were internally rotated by 5.1° ± 3.1° and 6.8° ± 6.1°, respectively, about the Transepicondylar axis (TEA). Although no gender-related differences were found for the TAL, they were found for the FAT. The variance of the TAL with respect to the TEA was significantly smaller compared with that for the FAT and thus exhibited a more consistent distribution. In addition, such a trend was found for both genders.
Conclusions
The results show that the TAL is a favorable index for appropriate rotational alignment of the femoral component in TKA.
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Details
1 Yonsei University, Department of Mechanical Engineering, Seoul, Republic of Korea (GRID:grid.15444.30) (ISNI:0000 0004 0470 5454)
2 Yonsei Sarang Hospital, Joint Reconstruction Center, Department of Orthopaedic Surgery, Seoul, Republic of Korea (GRID:grid.460167.2)
3 The bone hospital, Department of Orthopaedic Surgery, Seoul, Republic of Korea (GRID:grid.460167.2)
4 Gaja Yonsei Hospital, Orthopaedic Clinic, Incheon, Republic of Korea (GRID:grid.460167.2)