Radiculopathy / Peripheral Nerves C&P Exam Prep

Muscle Strength Testing (Manual Muscle Testing, 0-5 Scale)

What it measures: The strength of specific muscle groups innervated by the nerve(s) in question. For DC 8520 (sciatic/peroneal), key muscles include ankle dorsiflexors (tibialis anterior), toe extensors, plantar flexors, knee flexors, and hip extensors. For upper extremity nerves, this includes wrist extensors/flexors, finger intrinsics, elbow flexors/extensors.

What to expect: The examiner will ask you to resist force applied to your limb in specific positions. They will compare strength on the affected side to the unaffected side. Perform each movement to your true maximum ability - do not push through pain beyond what you can genuinely tolerate.

Pain considerations: If pain limits your effort during strength testing, clearly state 'I am stopping because of pain, not because I have reached full effort.' Document your pain level on a 0-10 scale at that point. Per DeLuca v. Brown, pain that limits strength must be factored into the rating.

Circumferential Limb Measurement (Muscle Atrophy Assessment)

What it measures: The circumference of the affected limb compared to the unaffected limb at the same anatomical landmark, to objectively document muscle atrophy caused by denervation or disuse. The DBQ specifically has fields for the normal side measurement and the atrophied side measurement.

What to expect: The examiner will use a tape measure to measure limb circumference at a consistent anatomical point (e.g., mid-thigh, mid-calf, mid-forearm). Both limbs are measured. A difference of 2 cm or more is typically considered clinically significant.

Pain considerations: Atrophy itself is not painful but results from the same nerve damage causing your pain. Ensure the examiner links the atrophy to the radiculopathy/nerve condition rather than treating it as an incidental finding.

Deep Tendon Reflexes (DTR)

What it measures: The integrity of reflex arcs at specific spinal levels. Absent or diminished reflexes are objective evidence of nerve root or peripheral nerve compromise. Key reflexes for lower extremity radiculopathy include the patellar reflex (L3-L4) and Achilles reflex (S1). For upper extremity: biceps (C5-C6), brachioradialis (C6), triceps (C7).

What to expect: The examiner will strike a tendon with a reflex hammer while your limb is relaxed. Results are graded 0 (absent), 1+ (diminished), 2+ (normal), 3+ (brisk), 4+ (hyperreflexive with clonus). Absent or diminished reflexes on the affected side are important objective findings.

Pain considerations: Reflex testing itself is not painful. However, if the examiner must position your limb in a way that causes pain (e.g., extending the knee for patellar reflex), communicate this clearly.

Sensory Testing (Light Touch, Pinprick, Vibration, Temperature)

What it measures: The integrity of sensory nerve fibers in specific dermatome distributions. For DC 8520/sciatic nerve: sensation along the posterior thigh, lateral leg, dorsum of foot, and plantar surface. For common peroneal (8720): dorsum of foot and lateral lower leg. For upper extremity nerves: specific finger and forearm distributions.

What to expect: The examiner may use a wisp of cotton, a pin, a tuning fork, or temperature objects to test sensation in specific areas. You will be asked whether you can feel the stimulus and whether it feels the same on both sides. Be honest about areas of reduced or absent sensation.

Pain considerations: Sensory testing should be performed with your eyes closed to prevent visual cues from influencing your responses. Give truthful, consistent answers. If certain areas are so hypersensitive that even light testing is painful, state this - it documents allodynia under the neuralgia framework.

Tinel's Sign and Phalen's Test

What it measures: Tinel's sign tests for nerve irritation or regeneration at a specific point along the nerve course by percussion. Phalen's test (sustained wrist flexion for 60 seconds) tests for median nerve compression at the carpal tunnel. These are relevant when upper extremity peripheral nerve entrapment is part of the claim (e.g., median, ulnar, radial nerves).

What to expect: For Tinel's, the examiner will tap along the course of the nerve (e.g., at the wrist, elbow, or fibular head). A positive result is a tingling or electric sensation radiating distally in the nerve distribution. For Phalen's, you hold your wrists in flexion for up to 60 seconds; reproduction of numbness or tingling in the median nerve distribution is positive.

Pain considerations: If percussing the nerve course (Tinel's) reproduces your worst neurological symptom, describe this in detail. The reproduction of your typical pain or paresthesias during provocative testing is an important objective correlation of your subjective complaint.

Grip and Pinch Strength Testing

What it measures: Functional hand strength when upper extremity peripheral nerves (radial, ulnar, median) are involved. Measured via dynamometer (grip) and pinch meter. Compared bilaterally. Weakness in grip or pinch reflects functional motor loss consistent with incomplete paralysis.

What to expect: You will be asked to squeeze a device as hard as possible, typically three times per hand. Results are averaged. The examiner will compare your affected to unaffected hand.

Pain considerations: If gripping causes pain or paresthesias, state this immediately during testing. Pain-limited grip is still grip impairment for rating purposes under DeLuca.

Gait Assessment

What it measures: Whether gait is normal or abnormal, and the etiology of any abnormal gait pattern. For lower extremity radiculopathy, common gait abnormalities include foot drop gait (steppage gait), antalgic gait, and Trendelenburg gait. The examiner will complete DBQ fields specifically asking whether gait is normal and, if not, to describe the abnormality and provide its etiology.

What to expect: You will be observed walking, potentially turning, and possibly heel-to-toe walking. The examiner assesses stride length, symmetry, foot clearance, trunk sway, and use of assistive devices.

Pain considerations: If walking during the exam causes you pain, numbness, or weakness that was not present at rest, communicate this immediately. Post-ambulatory symptom worsening is a DeLuca factor that must be documented.

80%

Complete paralysis of the sciatic nerve (DC 8520): The foot dangles and drops; no active movement possible of muscles below the knee; flexion of knee is weakened or (very rarely) lost. This represents the most severe presentation - total loss of motor function below the knee with associated sensory loss.

From 38 CFR: 38 CFR 4.124a, DC 8520: 'Complete; the foot dangles and drops, no active movement possible of muscles below the knee, flexion of knee weakened or (very rarely) lost - 80%'

60%

Incomplete paralysis of the sciatic nerve - Severe, with marked muscular atrophy. Motor function is significantly impaired but not completely absent. Profound weakness in ankle and toe dorsiflexion and plantar flexion with objectively measurable, marked atrophy of the affected limb. Function is severely limited.

From 38 CFR: 38 CFR 4.124a, DC 8520: 'Incomplete: Severe, with marked muscular atrophy - 60%'

40%

Incomplete paralysis of the sciatic nerve - Moderately severe. Significant motor and/or sensory impairment without the marked atrophy characteristic of the 60% level. Notable weakness in multiple muscle groups with functional limitations in ambulation and daily activities.

From 38 CFR: 38 CFR 4.124a, DC 8520: 'Incomplete: Moderately severe - 40%'

20%

Incomplete paralysis of the sciatic nerve - Moderate. Noticeable weakness and sensory deficit with functional impact but preserved ability to ambulate, usually without assistive devices. Objective findings on examination support nerve impairment.

From 38 CFR: 38 CFR 4.124a, DC 8520: 'Incomplete: Moderate - 20%'

10%

Incomplete paralysis of the sciatic nerve - Mild. Minimal objective findings but credible, consistent subjective symptoms. Some intermittent sensory symptoms with preserved strength. The examiner may find normal or borderline-low normal strength and reflexes, but the veteran's reported symptom history is consistent with mild peripheral nerve compromise.

From 38 CFR: 38 CFR 4.124a, DC 8520: 'Incomplete: Mild - 10%'

Pain Quality and Distribution

How to describe it: Describe the quality (burning, stabbing, electric, aching, throbbing, dull), location (starting point and radiation pattern), and distribution (does it follow a specific nerve path such as from the low back through the buttock, posterior thigh, lateral leg, and into the foot?). Specify whether pain is constant or intermittent, and what percentage of waking hours you experience it.

Example: On my worst days, I wake up with a burning, electric pain starting in my lower back that shoots straight down through my right buttock, down the back of my thigh, wraps around my outer calf, and goes into the top of my foot. The pain is a 9 out of 10 and feels like someone poured acid on the inside of my leg. I cannot put on socks without the sensation triggering an electric shock. I cannot get out of bed for the first two hours.

Examiner listens for: Specific dermatome distributions confirming the affected nerve root or peripheral nerve; consistency of the radiation pattern with known anatomical nerve courses; characteristic neuropathic pain descriptors (burning, electric, allodynia); clear connection between activity, position, or loading and symptom exacerbation.

Avoid: Saying only 'my leg hurts sometimes' without specifying the distribution, quality, or functional impact. Failing to describe radiation of pain beyond the back into the extremity obscures the radiculopathy component of the claim.

Numbness and Sensory Deficits

How to describe it: Describe exactly where you have reduced or absent sensation. Use anatomical landmarks (e.g., 'the top of my foot from my big toe to mid-foot feels like it is wearing a sock that I cannot remove'). Specify whether the numbness is constant or comes and goes, and whether it prevents you from detecting dangerous stimuli (e.g., 'I have burned my foot because I could not feel heat').

Example: My entire left foot - the top, all five toes, and the outer edge - feels completely numb all day long. I cannot feel the difference between hot and cold water, and I have scalded my foot twice in the shower without realizing it. I frequently trip because I cannot feel where my foot is landing.

Examiner listens for: Consistent dermatomal or nerve-distribution numbness that correlates with the claimed nerve; functional consequences of sensory loss (falls, burns, inability to sense footwear fit); distinction between hypoesthesia (reduced sensation) and anesthesia (absent sensation); allodynia (hypersensitivity to normally non-painful stimuli).

Avoid: Saying 'I feel tingling sometimes' without describing the anatomical distribution, frequency, or functional consequences. Numbness that causes falls, burns, or inability to sense pain is a significant safety finding that must be communicated.

Motor Weakness and Functional Limitations

How to describe it: Describe specific functional tasks you can no longer perform or perform with difficulty due to weakness: lifting the foot while walking, climbing stairs, rising from a chair, gripping objects, turning a key. Use before-and-after comparisons to service or prior to symptom onset. Quantify how far you can walk before weakness forces you to stop.

Example: On bad days, my right foot drags when I walk and I have tripped on flat sidewalks three times this month. I cannot walk up stairs without using the railing with both hands and leading with my left foot each step. I can walk maybe 50 feet before my leg goes weak and I have to sit down. I dropped a full coffee pot last week because my right hand went numb and I lost grip without warning.

Examiner listens for: Specific functional limitations tied to muscle groups served by the affected nerve; distance and terrain limitations; loss of fine motor or gross motor function; consistency with the objective examination findings; workplace and daily living impact.

Avoid: Saying 'I have some weakness' without describing specific tasks affected. Weakness that causes falls, drop attacks, or loss of occupational function is critical information. Do not perform tasks during the exam that you cannot actually do on a typical or bad day.

Flare-Ups

How to describe it: Describe what triggers a flare-up, how long it lasts, how severe it is at peak, and what happens to your function during a flare. Per M21-1 and DeLuca requirements, flare-up severity and duration must be factored into the rating. Report your worst-day functional status, not only your current exam-day status.

Example: About 2-3 times per week, something triggers a severe flare - usually walking more than a block, sitting for more than 20 minutes, or changes in weather. During a flare, the pain spikes to a 10 out of 10, my leg becomes so weak I cannot lift my foot, and I must lie flat for 4-6 hours with ice and medication before I can move again. The day after a flare I am bedridden.

Examiner listens for: Frequency, duration, and severity of flare-ups; what precipitates them; the degree to which flare-up severity exceeds the current exam-day presentation; any associated hospitalization or emergency care; impact of flares on work attendance and ability to maintain employment.

Avoid: Not mentioning flare-ups at all because you are 'not in a flare today.' The examiner is required under M21-1 to evaluate your condition at its worst, not only at the exam snapshot. Explicitly say: 'Today is not my worst day. My worst days look like this: [describe].'

Effect of Repetitive Use and Fatigue

How to describe it: Describe how your symptoms change with repeated use over the course of a day or a work shift. Under DeLuca v. Brown, the VA must consider the effect of repetitive use on function. Describe whether weakness or pain worsens with repeated activity (e.g., after walking multiple flights of stairs, after a full day of standing, after typing for an hour).

Example: In the morning I can usually walk from my bedroom to the kitchen - maybe 30 feet - before I start feeling the pain and weakness build. By midday, even after resting, my leg is so weak I cannot lift my foot properly and I start dragging it. By evening I am essentially unable to walk without support. If I try to push through and work a full day, I lose feeling in my foot entirely for the next 24 hours.

Examiner listens for: Progressive deterioration of function with continued or repeated use; contrast between first-attempt function and third-or-fourth-attempt function; evidence that the examination snapshot at the start of the exam does not represent function after any sustained activity; need for rest periods; impact on ability to sustain employment.

Avoid: Presenting only your at-rest, morning baseline capability without describing the deterioration that occurs with use. If the examiner only tests you once at the beginning of the exam, explicitly volunteer: 'If you tested me again after I walked for 10 minutes, the results would be significantly worse.'

Impact on Occupation and Daily Life

How to describe it: Describe specific job duties you can no longer perform, have been accommodated around, or that have forced you to leave employment. Also describe how the condition affects personal care (bathing, dressing), sleep quality (neuropathic pain disrupting sleep), recreation, family roles, and household tasks. The DBQ has a specific field asking the examiner to describe the impact of the peripheral nerve condition on occupation and daily activities.

Example: I had to leave my job as a mechanic because I could no longer stand on concrete for more than 10 minutes without my leg giving out and because I dropped tools, which was a safety hazard. At home, I cannot stand long enough to cook a full meal, I need help getting socks on because bending forward causes severe radiating pain, and I sleep only 3-4 hours a night because the burning in my foot wakes me up. I cannot play with my children or walk our dog.

Examiner listens for: Specific occupational restrictions or job loss; accommodation history; sleep disruption caused by neuropathic pain; dependency on others for activities of daily living; loss of recreational activities; economic impact; consistency between functional limitations described and objective examination findings.

Avoid: Saying 'it limits me a little' instead of providing concrete examples of what you can and cannot do. The DBQ field specifically asks for impact on each extremity affected - make sure the examiner documents every affected area with specific functional consequences.