Positive Trendelenburg sign is seen in: March 2007
**Core Concept**
The Trendelenburg sign is a clinical indicator of abdominal muscle weakness or pelvic floor dysfunction, specifically the iliopsoas and abdominal muscles. It is observed during physical examination, where the patient is asked to stand on one leg and the other leg is lifted. The Trendelenburg sign is positive when the pelvis on the opposite side of the lifted leg drops, indicating weakness of the abdominal muscles.
**Why the Correct Answer is Right**
A positive Trendelenburg sign is indicative of weakness in the abdominal muscles, particularly the iliopsoas muscle. When the patient lifts one leg, the weight of the body is transferred to the other leg, but if the abdominal muscles are weak, the pelvis on the opposite side of the lifted leg will sag. This is because the iliopsoas muscle, which helps to stabilize the pelvis, is not functioning properly. The Trendelenburg sign is a useful clinical indicator for identifying patients with abdominal muscle weakness or pelvic floor dysfunction.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Trendelenburg sign is not typically associated with hip or knee joint pathology.
**Option B:** This option is incorrect because the Trendelenburg sign is not indicative of neurological disorders such as Parkinson's disease or stroke, although it can be seen in patients with severe muscle weakness due to neurological conditions.
**Option C:** This option is incorrect because the Trendelenburg sign is not typically associated with lumbar spine pathology such as spondylolisthesis or disc herniation.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that a positive Trendelenburg sign can be an indicator of underlying muscle weakness, which may be due to various causes such as pelvic floor dysfunction, abdominal muscle weakness, or neurological disorders. This sign is often observed during physical examination and can be a useful clinical indicator for identifying patients who may require further evaluation and management.
**Correct Answer: D.**