**Question:** Most common type of hip dislocation is:

A. Anterior
B. Posterior
C. Lateral
D. Supraspinatus

**Core Concept:** Hip dislocation is a severe injury where the ball-and-socket joint of the hip is displaced out of its normal position. The most common types refer to the direction of the dislocation.

**Why the Correct Answer is Right:** The correct answer, B (Posterior), explains that a posterior hip dislocation occurs when the ball (femoral head) moves posteriorly (behind) the acetabulum (socket of the hip joint). This type is the most common due to the vulnerability of the joint capsule and ligaments in this position, making it more susceptible to injury.

**Why Each Wrong Option is Incorrect:**

A. Anterior (Option A) refers to a dislocation in which the ball moves anteriorly (forward) to the acetabulum, which is less common compared to posterior dislocation due to the stronger joint capsule and ligaments in this position.

C. Lateral (Option C) refers to a dislocation where the ball moves laterally (sideways) to the acetabulum. This type is less common than anterior and posterior dislocations because the joint capsule and ligaments are stronger in this position.

D. Supraspinatus (Option D) is a muscle located in the shoulder joint, unrelated to hip dislocations. This option is irrelevant to the question, as it refers to a muscular structure instead of a dislocation type.

**Clinical Pearl:** Understanding the different types of hip dislocations is crucial for accurate diagnosis and appropriate treatment. Rapid assessment and reduction of the dislocation are essential to prevent long-term complications, such as avascular necrosis (death of bone tissue) and joint instability.