Femoral neck is the region connecting the shaft of the thigh bone (femur) to its rounded head, which fits into the hip joint (Picture 1). The femoral neck is potentially weak, because of its relatively smaller cross-sectional area and spongy bone tissue (cancellous bone). It is a part of the weight-bearing axis, which means that the weight of the entire body passes through it. Hence, it is the most frequently injured part of the thigh bone. Apart from injuries, the femoral neck is also a site for birth defects, cysts, and osteoporosis. Birth defects as well as injuries in children, lead to abnormal inward or outward curvatures of the thigh bone at the neck, which is called as coxa vara and valga respectively (Latin coxa = hip).

FemurNeck

Picture 1: Femoral Neck
(source: Wikimedia)


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