Trendlenberg’s sign is positive in injury to:
**Core Concept:** Trendelenburg's sign is a clinical sign that indicates excessive lateral tilt of the pelvis or lumbar spine due to injuries to the abdominal organs or lower limb muscles or nerves. It is named after German surgeon Paul Trendelenburg who first described this phenomenon.
**Why the Correct Answer is Right:** Trendelenburg's sign is positive when there is injury to the abdominal organs, specifically the liver and spleen, or the lower limb muscles and nerves. When these structures are damaged, they cannot effectively counteract the gravitational pull on the abdomen, leading to the lateral tilt seen in Trendelenburg's sign.
**Why Each Wrong Option is Incorrect:**
A. Trendelenburg's sign is not typically seen in injuries to the liver and spleen alone. The injury should involve both organs for the sign to be positive.
B. While some lower limb injuries may cause Trendelenburg's sign, the correct answer is not limited to lower limb injuries only. The sign can result from injuries affecting the abdominal organs and muscles.
C. Trendelenburg's sign is also not solely caused by pelvic fractures. Injuries to abdominal organs and muscles are also necessary for the sign to be positive.
D. Trendelenburg's sign is not limited to injuries involving the lumbar spine. The injury should involve the abdominal organs and muscles to cause the lateral tilt seen in this clinical sign.
**Clinical Pearl:** Trendelenburg's sign helps clinicians in making a clinical diagnosis and prioritizing further investigations and management for patients presenting with this sign. It is of particular importance when assessing patients with trauma or abdominal pain, as it can indicate life-threatening injuries that require immediate attention.
**Correct Answer:** D. Trendelenburg's sign is positive in injuries involving the lumbar spine, which results in excessive lateral tilt of the pelvis and lumbar spine due to injuries to abdominal organs and muscles. This injury pattern leads to the characteristic lateral tilt observed in Trendelenburg's sign.