What reference lines are visible during femur axis definition?

What reference lines are visible during femur axis definition?

• A. AP Axis/Whiteside's Line
• B. Posterior Condylar Axis
• C. TransEpicondylar Axis
• D. All of the above

Answer: (D)

When defining the femur’s rotational axis, you rely on several landmarks that can be seen on the bone or on imaging. Whiteside’s line, the anteroposterior axis, runs from the deepest part of the trochlear groove to the center of the intercondylar notch and helps set the front-to-back orientation of the femur. The posterior condylar axis is a line tangent to the posterior aspects of the femoral condyles and serves as a practical reference from the back of the knee. The transepicondylar axis connects the most prominent points of the medial and lateral epicondyles and closely approximates the knee’s natural flexion-extension axis. Since each landmark can be identified and used to gauge femoral rotation, all of them are visible and useful in defining the axis. In practice, surgeons often use the transepicondylar axis as a primary reference, with Whiteside’s line and the posterior condylar axis providing cross-checks for anatomical variation.

When defining the femur’s rotational axis, you rely on several landmarks that can be seen on the bone or on imaging. Whiteside’s line, the anteroposterior axis, runs from the deepest part of the trochlear groove to the center of the intercondylar notch and helps set the front-to-back orientation of the femur. The posterior condylar axis is a line tangent to the posterior aspects of the femoral condyles and serves as a practical reference from the back of the knee. The transepicondylar axis connects the most prominent points of the medial and lateral epicondyles and closely approximates the knee’s natural flexion-extension axis. Since each landmark can be identified and used to gauge femoral rotation, all of them are visible and useful in defining the axis. In practice, surgeons often use the transepicondylar axis as a primary reference, with Whiteside’s line and the posterior condylar axis providing cross-checks for anatomical variation.