Defining the anatomic axis joint center distance and anatomic axis joint center ratio of the distal femur in the coronal plane
Date
2020-12
Journal Title
Journal ISSN
Volume Title
Publisher
Wolters Kluwer - Medknow
Abstract
Background: The aim of this radiographic study was to define the anatomic axis joint center
distance (aJCD) and anatomic axis joint center ratio (aJCR) of the distal femur in the coronal plane
for skeletally mature individuals. Methods: A cross‑sectional radiographic study was conducted
to calculate the horizontal distances between the anatomical axis and the center of the knee at the
level of the intercondylar notch and the joint line. Ratios relating these points to the width of the
femur were then calculated. Results: A total of 164 radiographs were included: 91 male (55.5%)
and 73 female patients (44.5%) with a mean age of 44.9 ± 18.1 years, with 79 right (48.2%) and
85 left (51.8%). The mean intercondylar width was 75.6 ± 6.6 mm, the mean aJCD at the notch
was 3.6 ± 1.8 mm, the mean aJCD at the joint line was 4.9 ± 1.8 mm, the mean aJCR at the notch
was 45.2 ± 2.4, and the mean aJCR at the joint line was 43.5 ± 2.4. The intercondylar width was
significantly different (P < 0.001) between males (79.5 ± 4.8 mm) and females (70.6 ± 5.0 mm).
A significant difference between the aJCR at the notch (P = 0.004) and the aJCR at the joint
line (P = 0.003) was observed in males and females. No differences between the aJCD at the notch
and/or aJCD at the joint line were observed between males versus females, left versus right, and
those younger versus those older than 65 years. Conclusion: This is the first objective description
of the aJCR of the distal femur in the coronal plane. This ratio can be used to aid the planning
and execution of distal femoral deformity correction, retrograde femoral nailing, and total knee
arthroplasty.
Level of Evidence: IV
Description
CITATION: Ferreira N, Cornelissen AJ, Burger M, Saini AK.2020. Defining the anatomic axis joint center distance and anatomic axis joint center ratio of the distal femur in the coronal plane. J Limb Lengthen Reconstr 6:121-5. doi.10.4103/jllr.jllr_26_20
The original publication is available at: jlimblengthrecon.org
The original publication is available at: jlimblengthrecon.org
Keywords
Joints -- Surgery, Intramedullary fracture fixation, Radiography in orthopedics, Bones -- Fractures, Lower limb alignment
Citation
Ferreira N, Cornelissen AJ, Burger M, Saini AK.2020. Defining the anatomic axis joint center distance and anatomic axis joint center ratio of the distal femur in the coronal plane. J Limb Lengthen Reconstr 6:121-5. doi.10.4103/jllr.jllr_26_20