**Core Concept**
The common peroneal nerve is a branch of the sciatic nerve that innervates the muscles of the lateral compartment of the leg, including the peroneus longus and peroneus brevis. Injury to this nerve can result in foot drop, a condition characterized by difficulty lifting the foot off the ground.

**Why the Correct Answer is Right**
Injury to the common peroneal nerve can lead to weakness or paralysis of the muscles it innervates, resulting in foot drop. This is due to the loss of motor function to the peroneal muscles, which are responsible for ankle dorsiflexion and eversion. The resulting foot drop can lead to a characteristic "steppage" gait, where the individual has to lift their knee high to compensate for the lack of ankle movement.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the features of common peroneal nerve injury do not typically include loss of sensation on the medial aspect of the leg. The common peroneal nerve primarily affects motor function, not sensory function.
* **Option B:** This option is incorrect because the features of common peroneal nerve injury do not typically include weakness of the tibialis anterior muscle. The tibialis anterior muscle is innervated by the deep peroneal nerve, which is a different branch of the sciatic nerve.
* **Option C:** This option is incorrect because the features of common peroneal nerve injury do not typically include loss of ankle inversion. The peroneal muscles primarily affect ankle eversion, not inversion.

**Clinical Pearl / High-Yield Fact**
A classic clinical sign of common peroneal nerve injury is the "foot drop" sign, where the individual has difficulty lifting the foot off the ground. This can be assessed by having the individual stand on the affected leg and then try to lift the heel off the ground.

**Correct Answer: C. Weakness of ankle eversion.**