A 25-year-old boy while playing cricket has a severe blow of cricket ball on the lateral side of the right knee . On X ray, fracture of the head and neck of the right fibula was seen . What other complication will occur from this fibular fracture
First, I need to recall the anatomy around the fibula, particularly the head and neck area. The fibula is the smaller of the two leg bones, running parallel to the tibia. The head of the fibula is located just below the knee joint. I remember that the common peroneal nerve wraps around the neck of the fibula. So, a fracture here could potentially damage this nerve.
The common peroneal nerve divides into the superficial and deep peroneal nerves. Damage to the common peroneal nerve can lead to foot drop, which is the inability to dorsiflex the foot. Patients might also have sensory loss on the dorsum of the foot and the anterolateral part of the leg. Since the injury is at the fibular head, which is near the knee, this is a classic location for common peroneal nerve injury.
Looking at the options, I need to consider other structures in the area. The tibial artery is in the posterior compartment, so a fibular fracture might not directly affect it. The peroneal tendons run behind the lateral malleolus, so a fibular fracture here might not impact them unless there's a specific injury there. The anterior tibial artery is more anterior, so not directly related. The sciatic nerve is higher up, so probably not involved here.
So the main complication here would be injury to the common peroneal nerve. The other options (like tibial artery injury or peroneal tendon damage) are less likely because of the location of the fibular fracture. The key is the proximity of the common peroneal nerve to the fibular head and neck.
**Core Concept**
Fractures of the fibular head/neck are anatomically significant due to the **common peroneal nerve** (CPN) looping around this region. Injury to the CPN leads to **foot drop** (loss of dorsiflexion and eversion) and sensory deficits over the dorsum of the foot and anterolateral leg.
**Why the Correct Answer is Right**
The **common peroneal nerve** wraps around the fibular neck, making it vulnerable to injury with fibular head fractures. This nerve innervates the **tibialis anterior** (dorsiflexion) and **peroneus longus/brevis** (eversion). Damage results in **foot drop**, difficulty walking on toes, and a "steppage gait." Sensory loss occurs over the dorsum of the foot and anterolateral leg due to superficial peroneal nerve involvement.
**Why Each Wrong Option is Incorrect**
**Option B:** Tibial artery injury is unlikely as it lies posterior to the tibia, not near the fibular head.
**Option C:** Peroneal tendons (peroneus longus/brevis) run behind the lateral malleolus, not the fibular head.
**Option D:** Sciatic nerve injury occurs higher (e.g., gluteal region) and is unrelated to fibular