**Question:** Major aerial supply to anterior cruciate ligament is from

A. Popliteal artery
B. Tibial artery
C. Radial artery
D. Common fibular artery

**Correct Answer:** B. Tibial artery

**Core Concept:** Anterior cruciate ligament (ACL) is one of the four main ligaments of the knee joint, providing structural integrity and stability. Ligaments receive their blood supply from the tibial and popliteal arteries, which are branches of the femoral artery.

**Why the Correct Answer is Right:** The tibial artery is a terminal branch of the internal iliac artery, which is a major component of the pelvic circulation. Within the knee, the tibial artery divides into the anterior and posterior tibial arteries. The anterior tibial artery (ATA) supplies blood to the ACL, ensuring its viability and healing capacity.

**Why Each Wrong Option is Incorrect:**

A. Popliteal artery: This artery supplies the posterior compartment of the lower limb, not the anterior compartment where the ACL resides.
B. Common fibular artery (peroneal artery): This artery is responsible for supplying blood to the peroneal muscles and skin, not the ACL.
C. Radial artery: This artery is involved in supplying blood to the upper limb and forearm, not the lower limb or knee joint.

**Clinical Pearl:** The ACL's arterial supply from the tibial artery highlights the importance of considering regional vascular anatomy when planning surgical procedures involving the knee joint. Understanding the vascular anatomy of the knee ensures proper surgical technique and minimizes the risk of iatrogenic injury to the ACL or other adjacent structures.