Deep lateral femoral notch sign
Measurement technique to determine the depth of the femoral notch on lateral x-rays

In radiology, the deep lateral femoral notch sign is a finding on a lateral radiograph that is considered an indirect sign of a torn anterior cruciate ligament (ACL).[1][2] It is an abnormal deepening of the lateral condylopatellar sulcus from an osteochondral impaction fracture.[1][3] A depth greater than 1.5 mm is a reliable sign of a torn ACL.[1]

References

  1. 1 2 3 Pao, D. G. (2001). "The lateral femoral notch sign". Radiology. 219 (3): 800–801. doi:10.1148/radiology.219.3.r01jn12800. PMID 11376273.
  2. ↑ Cobby, M. J.; Schweitzer, M. E.; Resnick, D. (1992). "The deep lateral femoral notch: An indirect sign of a torn anterior cruciate ligament". Radiology. 184 (3): 855–858. doi:10.1148/radiology.184.3.1509079. PMID 1509079.
  3. ↑ Yu, J. S.; Bosch, E.; Pathria, M. N.; McAndless, M.; Mishra, D.; Daniel, D.; Clopton, P.; Resnick, D. (1995). "Deep lateral femoral sulcus: Study of 124 patients with anterior cruciate ligament tear". Emergency Radiology. 2 (3): 129. doi:10.1007/BF02615790. S2CID 20538659.
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