Revision 10 for 'Blumensaat line'

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Blumensaat line

Blumensaat line corresponds to the roof of intercondylar notch of the femur as seen on lateral radiograph of knee joint. It has been used for:

  • indicating relative position of patella (normally this line intersects the lower pole of patella)
  • suggesting ACL injury (normal ACL Blumensaat angle is less than or equal to 15o)

It may not always be straight and three types have been described 3

  • straight: ~ 35%
  • small hill: ~ 20% 
  • large hill: ~ 45%


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