## Core Concept
Internal podalic version is an obstetric procedure used in obstructed labor where the fetus is converted from a cephalic (head) presentation to a breech presentation to facilitate delivery. This procedure carries significant risks due to the manipulation required and the context of obstructed labor.

## Why the Correct Answer is Right
The correct answer, uterine rupture, is a well-recognized complication of internal podalic version, especially in obstructed labor. Obstructed labor is a condition where despite strong uterine contractions, the progress of labor is impeded due to mechanical factors. The uterus is already under significant stress, and the manipulation involved in internal podalic version can cause a tear in the uterine wall, leading to rupture. This is a life-threatening emergency for both the mother and the fetus.

## Why Each Wrong Option is Incorrect
- **Option A:** While infection (or puerperal sepsis) is a risk in any obstetric intervention, especially in obstructed labor, it is not the most immediate or direct danger associated specifically with internal podalic version.
- **Option B:** Fetal injury can occur due to the manipulation involved in the procedure, but it is not the most critical or specific risk compared to uterine rupture in the context of obstructed labor.
- **Option C:** Maternal shock can result from various complications, including uterine rupture, but it is more of a consequence than a direct danger specific to the procedure.

## Clinical Pearl / High-Yield Fact
A key point to remember is that internal podalic version is a high-risk procedure that should be avoided whenever possible, especially in obstructed labor, due to the significant risk of uterine rupture. In modern obstetrics, this procedure is rarely performed and is generally considered obsolete due to the availability of safer alternatives like cesarean section.

## Correct Answer Line
**Correct Answer: D. Uterine rupture.**