Bilateral Lower Extremity Radiculopathy

How the conditions may be related

Lumbar disc herniation and degenerative disc disease cause radiculopathy through direct mechanical compression and inflammatory irritation of lumbosacral nerve roots. Herniated disc material (nucleus pulposus) contains phospholipase A2 and inflammatory cytokines that cause chemical radiculitis even without significant mechanical compression. The L4-L5 and L5-S1 levels are most commonly affected, producing sciatic nerve distribution symptoms (posterior thigh, lateral calf, foot). When bilateral disc disease or central stenosis is present, both lower extremities are affected. Each extremity's radiculopathy is rated separately — bilateral radiculopathy can significantly increase the combined rating. The bilateral factor (38 CFR § 4.26) adds approximately 10% to the combined bilateral rating.

“Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected.”

Look at the evidence behind the pairing

• Olmarker K et al. (1993) Spine (nucleus pulposus inflammatory radiculitis)
• Weinstein JN et al. (2006) JAMA (lumbar disc herniation outcomes — SPORT trial)
• Manchikanti L et al. (2014) Pain Physician (lumbar radiculopathy epidemiology).

Build the link to your own history

A nexus is the link between the two conditions. Relevant evidence can include medical records, a reasoned medical opinion, and, in some circumstances, lay evidence. A private nexus letter can help, but is not universally required. An opinion should explain how the evidence in your case supports causation or aggravation, rather than only naming a possible association.

A diagnosis does not guarantee an additional rating

A separately compensable secondary disability may receive its own evaluation, which VA combines with other ratings under 38 CFR § 4.25. Separate diagnoses do not always mean separate ratings: § 4.14 prohibits compensating the same manifestations more than once, and some body systems have additional rating rules. For aggravation, the compensable increase must account for the baseline severity.

The formula applies the whole-person concept: a 50% combined existing rating plus a new 30% rating yields 65% (rounded to 70%), not 80%.

This example starts with an unrounded combined value. If your current award was already rounded, use your individual ratings to calculate the new total. VA rounds to the nearest ten only after combining all applicable ratings.

Both causation and aggravation are forms of secondary service connection. Aggravation means an increase in severity attributable to a service-connected condition, beyond natural progression. Permanent worsening is not required under Ward v. Wilkie (2019). Section 3.310(b) also requires medical evidence establishing a baseline level of severity; VA deducts the baseline and any natural progression when determining the compensable increase.