**Question:** Rupture of membranous urethral injury more commonly due to

A. Trauma
B. Infections
C. Congenital abnormalities
D. Voiding dysfunction

**Core Concept:** Membranous urethral injury is a type of urethral injury that occurs in the middle part of the urethra, between the bulbous and spongy urethral segments. These injuries are often caused by blunt trauma or penetrating injuries, such as during sexual intercourse or firearm injuries.

**Why the Correct Answer is Right:** Membranous urethral rupture is more commonly due to trauma (option A) because the membranous urethra is particularly vulnerable to injury due to its location and thickness. The membranous urethra is located between the spongy and bulbous urethral segments, making it more susceptible to injury during blunt trauma or penetrating injuries.

**Why Each Wrong Option is Incorrect:**

**Option B (Infections):** Rupture of membranous urethra is not directly caused by infections, although secondary infections can occur after the initial injury.

**Option C (Congenital abnormalities):** While some cases of membranous urethral injury may be associated with congenital abnormalities, the correct answer should focus on the most common cause, which is trauma.

**Option D (Voiding dysfunction):** Voiding dysfunction is a symptom that can result from membranous urethral injury but is not the direct cause of the injury itself. Trauma is the primary factor leading to membranous urethral rupture.

**Clinical Pearl:** Membranous urethral rupture is a serious injury that requires prompt medical attention and intervention. In cases of suspected membranous urethral rupture, perform a detailed history and physical examination, including a thorough check for penile swelling and induration, purulent discharge, and urethral dilation. If the injury is suspected, consult a urologist for further evaluation, including digital rectal examination and urethrogram to confirm the diagnosis.

**Correct Answer:** A. Trauma - Membranous urethral rupture is commonly caused by blunt trauma or penetrating injuries, which can result in direct injury to the membranous urethra. These injuries are often seen in high-energy traumas like those resulting from motor vehicle accidents, sexual intercourse, or combat injuries.