**Core Concept**
Injury to the common peroneal nerve leads to foot drop, a condition characterized by weakness or paralysis of the muscles responsible for foot dorsiflexion. The common peroneal nerve is a branch of the sciatic nerve and is responsible for innervating the muscles of the lateral compartment of the leg, including the tibialis anterior, peroneus longus, and peroneus brevis.

**Why the Correct Answer is Right**
The common peroneal nerve is particularly susceptible to injury due to its superficial location and narrow diameter. When the nerve is compressed or damaged, it can lead to foot drop, which is often characterized by the inability to lift the foot upwards (dorsiflexion). This is because the muscles of the lateral compartment of the leg are unable to contract properly. The tibialis anterior muscle, which is responsible for dorsiflexion, is often the most affected muscle in cases of common peroneal nerve injury.

**Why Each Wrong Option is Incorrect**
* **Option A:** Injury to the lateral femoral cutaneous nerve can cause meralgia paresthetica, a condition characterized by numbness and tingling in the lateral thigh, but it does not cause foot drop.
* **Option B:** Injury to the obturator nerve can cause weakness in the adductor muscles of the thigh, but it does not cause foot drop.
* **Option C:** Injury to the femoral nerve can cause weakness in the quadriceps muscles, leading to an inability to straighten the knee, but it does not cause foot drop.

**Clinical Pearl / High-Yield Fact**
In cases of foot drop, it is essential to perform a thorough neurological examination to determine the level and extent of nerve damage. A foot drop gait is often characterized by a steppage gait, where the individual lifts their foot higher than normal to avoid dragging the toes on the ground.

**Correct Answer: C. Injury to the common peroneal nerve leads to foot drop.**