Which distribution is assessed in the Van der Wurff cluster?

Which distribution is assessed in the Van der Wurff cluster?

• A. Dermatomal pain distribution
• B. Diffuse non-dermatomal pain
• C. Local knee pain
• D. Pain with resisted elbow flexion

Answer: (A)

The main idea here is that radicular or nerve-root–related pain tends to travel in a dermatomal pattern, following the sensory map of a specific spinal nerve. The Van der Wurff cluster is used to identify this nerve-root–driven pain by checking whether the patient’s pain follows a dermatomal distribution. That dermatomal spread supports radiculopathy rather than pain that is diffuse, non-dermatomal, or localized to a joint or muscle. So, the best choice is dermatomal pain distribution because it directly reflects pain that tracks along a single nerve root’s dermatome, which is what the cluster is designed to detect. Diffuse non-dermatomal pain would not show a spinal-nerve–aligned pattern; local knee pain points to a joint or local tissue issue; pain with resisted elbow flexion is about muscle strength or a local problem rather than a dermatomal pattern.

The main idea here is that radicular or nerve-root–related pain tends to travel in a dermatomal pattern, following the sensory map of a specific spinal nerve. The Van der Wurff cluster is used to identify this nerve-root–driven pain by checking whether the patient’s pain follows a dermatomal distribution. That dermatomal spread supports radiculopathy rather than pain that is diffuse, non-dermatomal, or localized to a joint or muscle.

So, the best choice is dermatomal pain distribution because it directly reflects pain that tracks along a single nerve root’s dermatome, which is what the cluster is designed to detect. Diffuse non-dermatomal pain would not show a spinal-nerve–aligned pattern; local knee pain points to a joint or local tissue issue; pain with resisted elbow flexion is about muscle strength or a local problem rather than a dermatomal pattern.