The concave region at the lower end of the femur. More commonly called the trochlea or trochlear groove.
The femoral (trochlear) groove is cartilage-covered and it is in this groove that the patella (kneecap) runs. This articulation (joint) is called the 'patello-femoral' joint.
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A general term implying that there is some abnormal process going on in the joint cartilage and underlying bone.