Blumensaat's line is a line which corresponds to the roof of the intercondylar fossa of femur as seen on a lateral radiograph of the knee joint.
[1] The angle at which this line appears on the radiograph can be used to determine the position of the patella or diagnose an ACL injury.
[2] On a normal radiograph, the line intersects the inferior pole of the patella, and so can be useful in diagnosing a broken femur as well as a patellar tendon rupture.
It also helps to define "Schottle point" intra-operatively for reconstruction of MPFL(Medial patello-femoral ligament.
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