**Question:** Codman's triangle is seen in –

A. Sacral hiatus
B. Gluteus maximus muscle
C. Alar ligament
D. Superior gluteal artery

**Core Concept:**
Codman's triangle is a triangular region formed by three anatomical landmarks. It is named after E.R.C. Codman, an American surgeon. The triangle is crucial for surgeons, anesthesiologists, and radiologists as it helps understand vascular anatomy, nerve supply, and surgical approaches to the gluteal region.

**Why the Correct Answer is Right:**
The correct answer is C. Alar ligament. Codman's triangle is formed by the anterior border of the gluteus maximus muscle, the posterior border of the gluteus medius muscle, and the medial border of the gluteus minimus muscle. The alar ligament is a thin, flat structure that connects the iliac spine to the pubic symphysis. It plays a significant role in the formation of Codman's triangle.

**Why Each Wrong Option is Incorrect:**
A. Sacral hiatus is incorrect because it refers to a space within the pelvic floor, not part of the formation of Codman's triangle.
B. Gluteus maximus muscle is not involved in the formation of Codman's triangle; it is too wide and does not connect the other two muscles.
D. Superior gluteal artery is not relevant to the formation of Codman's triangle, as it is a blood vessel, not a muscle, ligament, or landmark in the region.

**Clinical Pearl:**
Understanding Codman's triangle is essential for safe and effective surgical procedures in the gluteal region. It helps identify the nerves and arteries that pass through the triangle, enabling safe dissection and minimizing complications. For example, the superior gluteal artery and vein pass through the triangle, while the superior gluteal nerve runs along the posterior border of the triangle. This knowledge is vital for surgeons, anesthesiologists, and radiologists when performing procedures like hip arthroscopy, gluteal surgeries, or evaluating pelvic pain.