Posterior dislocation of hip is characterized by DELETE
**Core Concept**
Posterior dislocation of the hip is a serious injury that involves the femoral head being displaced out of the acetabulum in a posterior direction. This type of injury is often associated with a **flexed, adducted, and internally rotated** position of the hip. The **sciatic nerve** is at risk of injury due to its proximity to the dislocation site.
**Why the Correct Answer is Right**
The correct answer is related to the characteristic position of the hip in posterior dislocation, which is **shortened, flexed, adducted, and internally rotated**. This position is due to the posterior displacement of the femoral head, causing the affected limb to appear shorter compared to the unaffected side. The **piriformis muscle** and other short external rotators may be stretched or torn, contributing to the deformity.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the characteristic position of the hip in posterior dislocation.
**Option B:** This option is also incorrect as it does not match the typical presentation of posterior hip dislocation.
**Option C:** Similarly, this option is incorrect as it fails to describe the classic deformity associated with posterior dislocation.
**Option D:** This option is incorrect because it is not a recognized characteristic of posterior hip dislocation.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that posterior dislocation of the hip can be associated with **sciatic nerve injury**, leading to neurological deficits such as numbness, weakness, or paralysis of the affected limb. Prompt recognition and reduction of the dislocation are crucial to minimize long-term complications.
**Correct Answer:** D. shortened, flexed, adducted, and internally rotated.