Schober’s sign is used to evaluate
**Core Concept**
Schober's sign is a clinical measurement used to assess the flexibility of the lumbar spine in patients with ankylosing spondylitis or other conditions that cause spinal stiffness. It involves measuring the distance between two marks on the patient's back, one at the level of the umbilicus and the other 10 cm below it, before and after the patient flexes forward.
**Why the Correct Answer is Right**
The correct answer is related to the assessment of lumbar spine flexibility, which is crucial in diagnosing conditions like ankylosing spondylitis. Schober's sign measures the range of motion in the lumbar spine by quantifying the distance between the two marks before and after flexion. This helps clinicians to evaluate the severity of spinal stiffness and monitor the progression of the disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Schober's sign is not used to evaluate the range of motion in the cervical spine.
**Option B:** This option is incorrect because Schober's sign is not used to assess the flexibility of the hip joint.
**Option C:** This option is incorrect because Schober's sign is not used to evaluate the range of motion in the shoulder joint.
**Clinical Pearl / High-Yield Fact**
Schober's sign is a simple and non-invasive test that can be used to monitor the progression of ankylosing spondylitis and other conditions that cause spinal stiffness. It is essential for clinicians to be aware of this test and its clinical significance to provide accurate diagnoses and effective treatment plans.
**Correct Answer:** C.