A 22-year-old woman is found in a comatose condition, having lain for an unknown length of time on the tile floor of the courtyard. She is found in possession of cocaine. The patient is transported to the hospital while EMT personnel receive instructions for treatment of drug overdose. During the physical examination the patient’s gluteal region shows signs of ischemia. After regaining consciousness, she exhibits paralysis of knee flexion and dorsal and plantar flexion and sensory loss in the limb. What is the most likely diagnosis?

**Core Concept**
The patient's symptoms are likely due to a specific type of ischemia caused by compression of a major nerve and artery in the gluteal region, which is a common complication of drug overdose and prolonged compression.

**Why the Correct Answer is Right**
The patient's symptoms of paralysis of knee flexion and dorsal and plantar flexion, along with sensory loss in the limb, are classic signs of peroneal nerve and popliteal artery compression. The peroneal nerve and popliteal artery run close to each other in the popliteal fossa, and prolonged compression of this area can lead to ischemia and nerve damage. The patient's gluteal region showing signs of ischemia suggests that the compression occurred in the popliteal fossa. The patient's history of cocaine use and prolonged lying on the tile floor also supports this diagnosis, as cocaine can cause vasospasm and reduce blood flow to the affected area.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not take into account the patient's gluteal region showing signs of ischemia, which is a key clue to the diagnosis.
**Option B:** This option is incorrect because it does not explain the patient's sensory loss in the limb, which is a key feature of peroneal nerve compression.
**Option C:** This option is incorrect because it does not take into account the patient's history of cocaine use and prolonged lying on the tile floor, which are risk factors for peroneal nerve and popliteal artery compression.

**Clinical Pearl / High-Yield Fact**
The peroneal nerve and popliteal artery run close to each other in the popliteal fossa, making this area vulnerable to compression and ischemia. This is a classic exam trap, and students should remember that prolonged compression of this area can lead to nerve damage and ischemia, especially in patients with risk factors such as cocaine use and prolonged lying on a hard surface.

**Correct Answer: C. Peroneal nerve and popliteal artery compression**

✓ Correct Answer: C. Gluteal crush injury