Which nerve is injured in fracture of fibula:
**Core Concept**
Injury to the fibula in the lower leg can compromise nearby nerves due to anatomical proximity. The common peroneal nerve, a branch of the sciatic nerve, is particularly vulnerable to injury.
**Why the Correct Answer is Right**
The common peroneal nerve is located on the lateral aspect of the knee, wrapping around the lateral aspect of the fibula. This anatomical relationship makes it susceptible to injury in cases of fibular fracture. The nerve supplies the muscles of the lateral and anterior compartments of the leg, controlling foot and ankle movements. Damage to this nerve can result in foot drop, weakness, or paralysis.
**Why Each Wrong Option is Incorrect**
**Option A:** The tibial nerve is not directly associated with the fibula and is more likely to be injured in fractures of the tibia.
**Option B:** The sural nerve, while present in the lower leg, is not typically injured in fibular fractures and is more associated with the posterior tibial artery.
**Option C:** The saphenous nerve is primarily a sensory nerve and is not typically damaged in fibular fractures.
**Clinical Pearl / High-Yield Fact**
Injury to the common peroneal nerve can result in foot drop, a condition characterized by the inability to dorsiflex the foot. This can lead to difficulties walking or standing on uneven surfaces.
**Correct Answer: A. Common peroneal nerve**