Diagnosing Nerve Damage with EMG [Example 3] | UE Radiculopathy

The video tutorial explains how to use electromyography (EMG) data to diagnose nerve injuries, specifically focusing on radiculopathy in the lower extremity. It guides viewers through identifying affected muscles, confirming the involvement of the L5 nerve root, and understanding nerve anatomy. The tutorial emphasizes the importance of checking both affected and unaffected muscles and highlights the role of the dorsal ramus in confirming radiculopathy.

What is the first step in determining if there is nerve root involvement in a nerve injury?

• Assess physical damage

• Check for chemical irritation

• Identify affected muscles

• Examine the spinal cord

Which nerve root is common to all the affected muscles in the case study?

• L3

• S1

• L5

• L4

Why is it important to check unaffected muscles when diagnosing radiculopathy?

• To confirm they have the same nerve root involvement

• To ensure they do not share the affected nerve root

• To identify new symptoms

• To assess muscle strength

What additional step is suggested to confirm a radiculopathy diagnosis?

• Check for muscle atrophy

• Examine nerves originating directly from the roots

• Perform a blood test

• Conduct a physical therapy session

What is the role of the dorsal ramus in confirming radiculopathy?

• Its involvement strongly indicates radiculopathy

• It only affects the lumbar region

• It is unaffected by radiculopathy

• It innervates the anterior muscles

Which muscles are innervated by the dorsal ramus?

• Tibialis anterior

• Quadriceps

• Gastrocnemius

• Erector spinae

What confirms the final diagnosis of L5 radiculopathy?

• Presence of S1 in affected muscles

• Affected dorsal ramus and L5 involvement in affected muscles

• Absence of L5 in affected muscles

• Presence of L5 in unaffected muscles