Claudication refers to pain caused by too little blood flow, typically during exercise. It occurs due to vascular insufficiency, often related to peripheral artery disease. Specifically, claudication caused by popliteal artery or femoral artery incompetence results in decreased blood flow beyond these arteries.
To understand where pain would manifest due to this condition, it's important to consider the anatomical distribution of blood supply:
The popliteal artery is a direct continuation of the femoral artery and passes through the knee area, supplying blood to regions downstream, including the lower leg regions—primarily the calf. Incompetence or blockage in these arteries can lead to decreased perfusion specifically in these downstream areas.
Thus, based on the understanding of blood flow and anatomy, claudication due to popliteal femoral incompetence is primarily seen in the calf muscles during exertion.
Conclusion: The correct answer is Calf.