**Question:** In posterior dislocation of elbow, most prominent point on the forearm would be:

A. Radial head
B. Distal radioulnar joint
C. Ulnar head
D. Radiocapitellar joint

**Core Concept:** Posterior dislocation of the elbow is a type of elbow dislocation where the forearm bone (radius and ulna) moves posterior to the humerus bone. This leads to compression and injury to the ulnar nerve and soft tissues.

**Why the Correct Answer is Right:** The correct answer is **C. Ulnar head**. In a posterior dislocation of the elbow, the forearm bones (radius and ulna) move posteriorly to the humerus bone. The ulnar head is the prominent point on the ulna bone, which is the smaller and more medial of the two forearm bones. In this scenario, it is the ulnar head that becomes prominent due to its displacement behind the humerus.

**Why Each Wrong Option is Incorrect:**

A. Radial head: In a posterior dislocation, the radial head remains in the anterior part of the joint due to its larger size and the surrounding collateral ligaments.

B. Distal radioulnar joint: This is the joint between the radius and ulna at the wrist level, not relevant to the prominence in a posterior elbow dislocation.

D. Radiocapitellar joint: This is the joint between the humerus and capitulum (capitate bone) that forms part of the carpal bones in the wrist, not relevant to the prominence in a posterior elbow dislocation.

**Clinical Pearl:** Posterior dislocation of the elbow is a rare injury but one that should be suspected in patients with a displaced ulnar-sided posterior elbow swelling, deformity, and loss of range of motion. Immediate reduction and immobilization are crucial for optimal outcomes.