Which of the following clinical test when positive suggests presence of sensory ataxia?
**Core Concept**
Sensory ataxia is a type of ataxia characterized by impaired sensory input from the proprioceptive and vestibular systems, leading to difficulty with coordination and balance. This condition often results from damage to the peripheral nerves or the dorsal columns of the spinal cord.
**Why the Correct Answer is Right**
The Romberg test is a clinical examination used to assess a patient's ability to maintain balance with their eyes closed. A positive Romberg test indicates the presence of sensory ataxia, as the patient is unable to maintain their balance without visual input. This is because the dorsal columns, which transmit sensory information from the proprioceptors and vestibular apparatus, are damaged. The absence of sensory input from these structures impairs the patient's ability to maintain balance.
**Why Each Wrong Option is Incorrect**
**Option A:** The Heel-To-Toe Walking Test is used to assess cerebellar function, particularly coordination and balance. A positive result in this test would suggest cerebellar ataxia, not sensory ataxia.
**Option B:** The Finger-Nose Test is another cerebellar function test, evaluating coordination and fine motor skills. A positive result would indicate cerebellar dysfunction, not sensory ataxia.
**Option C:** The Tandem Walking Test is a test of cerebellar function, specifically assessing coordination and balance. A positive result would suggest cerebellar ataxia, not sensory ataxia.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that sensory ataxia can be caused by damage to the peripheral nerves or the dorsal columns of the spinal cord, which can lead to impaired sensory input and difficulty with balance and coordination.
**Correct Answer:** C. The Tandem Walking Test is a test of cerebellar function, specifically assessing coordination and balance. A positive result would suggest cerebellar ataxia, not sensory ataxia.