Traumatic dislocation of hip is characterized by
**Core Concept**
Traumatic dislocation of the hip is a severe injury that occurs when the femoral head is forcibly displaced from the acetabulum, often due to high-energy trauma. This condition requires prompt recognition and treatment to prevent complications such as avascular necrosis and osteoarthritis.
**Why the Correct Answer is Right**
The most common type of traumatic hip dislocation is posterior dislocation, accounting for approximately 90% of cases. This occurs when the femoral head is displaced posteriorly out of the acetabulum, often due to a combination of flexion, abduction, and external rotation forces. The sciatic nerve and femoral vessels are at risk of injury during this type of dislocation.
**Why Each Wrong Option is Incorrect**
* **Option A:** Anterior dislocation is less common, accounting for about 10% of traumatic hip dislocations, and typically results from a direct blow to the posterior aspect of the hip.
* **Option B:** Central dislocation is a rare and complex type of dislocation where the femoral head is displaced into the pelvis, often requiring surgical intervention.
* **Option D:** There is no such thing as "lateral dislocation" of the hip.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that a patient with traumatic hip dislocation may present with a shortened limb, external rotation of the affected limb, and limited range of motion in the hip joint.
**Correct Answer:** A. Posterior dislocation.