The notch in the knee world refers to the 'intercondylar notch'.

intercondylar notch
The notch is the space between the two rounded condyles of the femur bone. The notch is usually occupied by the cruciate igaments, but they are not shown in this illustration.
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Dr Sheila StroverĀ (Editor)
BSc (Hons), MB BCh, MBA

See biography...