## Most Common Site of PAD in Lower Limb **Key Point:** The superficial femoral artery (SFA) is the most common site of atherosclerotic lesions in peripheral arterial disease, accounting for approximately 40–50% of all lower limb stenoses and occlusions [cite:Robbins 10e Ch 10]. ### Anatomical Basis The SFA is particularly vulnerable because: - It is the longest continuous artery in the lower limb - It undergoes significant mechanical stress and bending at the adductor canal - It has relatively poor collateral circulation compared to proximal vessels - Turbulent flow at branch points predisposes to plaque formation ### Frequency Distribution of PAD Sites | Site | Frequency | Clinical Presentation | |------|-----------|----------------------| | Superficial femoral artery | 40–50% | Claudication (thigh/calf) | | Iliac artery | 20–30% | Claudication (hip/buttock) | | Popliteal artery | 15–20% | Claudication (calf) | | Anterior/posterior tibial arteries | 10–15% | Claudication (foot/ankle) | ### Clinical Pearl SFA occlusions often present with claudication in the calf rather than the thigh, because collateral flow from the profunda femoris artery compensates for proximal SFA disease. This is why the symptom location does not always match the anatomical lesion site. **High-Yield:** The "femoropopliteal segment" (SFA + popliteal artery) together accounts for >60% of all symptomatic PAD in the lower limb — this is the "workhorse" of vascular disease in the leg. ### Why Other Sites Are Less Common - **Iliac artery:** Second most common, but typically causes hip/buttock claudication rather than calf symptoms - **Popliteal artery:** Third most common; often occurs as part of femoropopliteal disease - **Tibial arteries:** Least common in isolation; more often seen in diabetic patients with diffuse small-vessel disease
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