The Coronal Angulation of the Femur in Thai Osteoarthritic Knee Patients with Varus Deformity
Keywords:
Distal femoral axis-femoral mechanical axis angle; femoral bow; varus deformityAbstract
Objective: To determine the angulation of the distal femoral axis - femoral mechanical axis and the coronal femoral bowing
in varus OA knees. This information is necessar, because the routine distal femoral valgus cut can potentially lead to error in
post-operative alignment.
Methods: Hip to ankle standing radiographs were ordered in 160 varus OA patients (200 limbs). The mean age of the patients
was 63.8 years. In addition, 50 limbs of young volunteers with an average age of 28.8 years, were also studied for comparison.
The distal femoral axis-femoral mechanical axis angle, femoral bow, and other angles were determined and compared
between two groups.
Results: Mean distal femoral axis-mechanical axis angle was 7.0o ± 1.5o and mean femoral bow was 2.4o ± 2.6o in patients
compared to 5.7o ± 0.5o and 0.3o ± 0.5o respectively, in controls. The varus deformity significantly correlated with femoral
bowing. Thirty-five (17.5 percent) of OA limbs showed a distal femoral axis-mechanical axis angle of more than 9o and there
were 42 OA limbs (21%) that had significant (> 3o) femoral bowing.
Conclusion: These findings have implications in deciding the optimum valgus angle at which to perform distal femoral resection
during TKA in varus OA knee.
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