![Lateral radiograph of a ACL-deficient knee with a deep lateral femoral notch sign The depth was measured by drawing a line over the femoral condyle (long line) and a small line perpendicular to this line and the deepest point of the depression (black arrow)"

Lodewijks, P.C.A.M., Delawi, D., Bollen, T.L. et al. - Lodewijks, P.C.A.M., Delawi, D., Bollen, T.L. et al. The lateral femoral notch sign: a reliable diagnostic measurement in acute anterior cruciate ligament injury. Knee Surg Sports Traumatol Arthrosc 27, 659–664 (2019). https://doi.org/10.1007/s00167-018-5214-x https://link.springer.com/article/10.1007/s00167-018-5214-x](attachment:42ec47e3-8ff3-49dd-8476-2c5a9308120f:3bf7e41b-43cc-4812-83a6-f78d4d6fe723.png)

Lateral radiograph of a ACL-deficient knee with a deep lateral femoral notch sign The depth was measured by drawing a line over the femoral condyle (long line) and a small line perpendicular to this line and the deepest point of the depression (black arrow)"

Lodewijks, P.C.A.M., Delawi, D., Bollen, T.L. et al. - Lodewijks, P.C.A.M., Delawi, D., Bollen, T.L. et al. The lateral femoral notch sign: a reliable diagnostic measurement in acute anterior cruciate ligament injury. Knee Surg Sports Traumatol Arthrosc 27, 659–664 (2019). https://doi.org/10.1007/s00167-018-5214-x https://link.springer.com/article/10.1007/s00167-018-5214-x

Further reading:

https://doi.org/10.1148/radiology.219.3.r01jn12800

https://doi.org/10.1007/s00167-018-5214-x