## **Core Concept**
The question tests knowledge of vascular anatomy in relation to femoral fractures. The patient's symptoms suggest compromised blood flow to the lower leg, indicated by pallor and absence of the dorsalis pedis pulse. This points towards an injury affecting the arterial supply to the lower limb.

## **Why the Correct Answer is Right**
The correct answer, **Popliteal artery**, is the most likely to be compressed by a fracture of the femur immediately proximal to the femoral condyles. The popliteal artery is located posteriorly in the thigh, close to the distal end of the femur. It passes through the adductor hiatus, an aponeurotic opening in the adductor magnus muscle, to enter the posterior aspect of the knee, where it becomes the popliteal artery. A fracture in this region can easily compress or damage this artery, leading to reduced blood flow to the lower leg, as evidenced by the patient's symptoms.

## **Why Each Wrong Option is Incorrect**
- **Option A: Femoral artery** - The femoral artery is located more proximally in the thigh and is less likely to be directly compressed by a fracture immediately proximal to the femoral condyles.
- **Option B: Anterior tibial artery** - This artery is a branch of the popliteal artery, and while it could be affected by decreased flow from a popliteal artery injury, it is not directly compressed by the fracture described.
- **Option D: Deep circumflex iliac artery** - This artery arises from the external iliac artery and primarily supplies the iliacus muscle and the abdominal wall. It is not directly related to the arterial supply of the lower limb below the knee.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that fractures near the knee, especially those involving the distal femur, can compromise the popliteal artery. This can lead to ischemia of the lower limb, which is a limb-threatening emergency. Prompt recognition and management are crucial.

## **Correct Answer: C. Popliteal artery**