Phalen’s test positive in
**Core Concept**
Phalen's test is a clinical examination used to diagnose and assess the severity of carpal tunnel syndrome (CTS), a common condition characterized by compression of the median nerve within the carpal tunnel. The test involves flexion of the wrist to reproduce symptoms of CTS, which are typically numbness, tingling, and pain in the thumb, index finger, middle finger, and half of the ring finger.
**Why the Correct Answer is Right**
The mechanism of Phalen's test involves flexion of the wrist, which increases pressure within the carpal tunnel and compresses the median nerve. This compression can reproduce symptoms of CTS, making the test a useful diagnostic tool. The carpal tunnel is a narrow, fibrous passageway on the palmar side of the wrist that contains the median nerve, flexor tendons, and other structures. Phalen's test takes advantage of this anatomical arrangement to assess for median nerve compression.
**Why Each Wrong Option is Incorrect**
**Option A:** This is a distractor and does not relate to Phalen's test or carpal tunnel syndrome.
**Option B:** This option does not describe a specific condition or anatomical structure relevant to Phalen's test.
**Option C:** This is not a correct description of the clinical presentation of carpal tunnel syndrome.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that Phalen's test is a dynamic test, meaning it requires active movement (wrist flexion) to reproduce symptoms of CTS. This distinguishes it from static tests, which assess for symptoms at rest.
**Correct Answer:** C. Carpal tunnel syndrome.