Secondary service connection
Intervertebral disc syndrome secondary to a knee condition: BVA grant rates and what wins
From 2017 to 2026, the Board of Veterans' Appeals decided intervertebral disc syndrome claimed as secondary to a knee condition in 1,767 decisions. It granted the issue in 19.8% of them, close to the 19.2% grant rate for all intervertebral disc syndrome issues, denied it in 13.0%, and remanded it in 64.7%. Counting only decisions on the merits, 60.4% were granted.
Decisions
1,767
2017–2026
Granted
19.8%
All intervertebral disc syndrome: 19.2%
Granted on the merits
60.4%
Granted ÷ (granted + denied)
Remanded
64.7%
Denied: 13.0%
See all intervertebral disc syndrome decisions, direct and secondary.
Intervertebral disc syndrome secondary to a knee condition: outcomes by year
| Year | Issues decided | Granted | Denied | Remanded | Other |
|---|---|---|---|---|---|
| 2017 | 107 | 8.4% | 21.5% | 55.1% | 15.0% |
| 2018 | 184 | 15.2% | 17.4% | 64.7% | 2.7% |
| 2019 | 213 | 16.4% | 9.4% | 71.4% | 2.8% |
| 2020 | 207 | 18.4% | 16.9% | 62.8% | 1.9% |
| 2021 | 214 | 17.8% | 13.6% | 66.8% | 1.9% |
| 2022 | 198 | 13.6% | 10.1% | 74.2% | 2.0% |
| 2023 | 217 | 20.3% | 11.1% | 66.8% | 1.8% |
| 2024 | 207 | 26.6% | 7.7% | 64.7% | 1.0% |
| 2025 | 162 | 32.7% | 13.6% | 52.5% | 1.2% |
| 2026 | 79 | 30.4% | 13.9% | 54.4% | 1.3% |
Each row counts issues (each condition the Board decided), so the shares add up to 100%. Other: dismissed, withdrawn or no clear outcome. Years with fewer than 20 issues are left out.
Evidence in granted and denied intervertebral disc syndrome decisions
For each kind of supporting evidence: how often the Board granted the intervertebral disc syndrome issue on the merits when the decision mentioned it, compared with decisions that did not. These are associations, not causes, and evidence is recorded per decision, not per issue.
| In the record | Decisions | Granted when present | When absent | Difference |
|---|---|---|---|---|
| Positive nexus opinion | 448 | 91.8% | 28.8% | +62.9 pts |
| Private medical opinion | 710 | 74.0% | 39.1% | +34.9 pts |
| Favorable VA exam | 177 | 78.3% | 56.4% | +21.9 pts |
| Treating physician opinion | 108 | 78.7% | 58.3% | +20.4 pts |
| Buddy statement | 42 | 76.9% | 60.1% | +16.9 pts |
| Combat service | 46 | 56.3% | 60.6% | −4.3 pts |
| Lay statement | 1,440 | 55.3% | 85.0% | −29.7 pts |
- The Board applied the benefit-of-the-doubt rule (38 CFR 3.102) in 79.4% of the decisions that granted intervertebral disc syndrome.
- The Board found the veteran's statements credible in 23.7% of grants and 14.4% of denials.
Negative evidence in the record
An unfavorable exam or a negative nexus opinion often sits in the same record as favorable evidence, and the Board weighs them against each other. So these rows show how often intervertebral disc syndrome was still granted when the record contained the negative item, not that the item helped.
| In the record | Decisions | Granted when present | When absent | Difference |
|---|---|---|---|---|
| Unfavorable VA exam | 1,459 | 58.8% | 73.1% | −14.3 pts |
| Negative nexus opinion | 1,220 | 57.0% | 72.2% | −15.2 pts |
How these claims are argued
A secondary claim says a knee condition caused intervertebral disc syndrome or made it worse, and names how. Below: whether the Board's decision discussed aggravation, and the medical link each decision names, with how often those issues were granted.
Aggravation discussed
made worse by the disability, 3.310(b)
11.5%
granted, of 859 issues (48.0% of all)
Causation only
caused by the disability, 3.310(a)
27.1%
granted, of 929 issues (52.0% of all)
| Medical link named | Issues | Granted |
|---|---|---|
Altered gait or overuse Granted “The veteran reported pain and functional impairment, and a private orthopedist opined that the knee condition altered gait and posture, leading to back pain.” A26000574 (2026) Denied “no chronic gait alteration documented..” 26001600 (2026) | 413 | 36.1% |
Nerve involvement Granted “Service connection for lumbar strain with bilateral lower extremity radiculitis and lumbar facet spondylitis was granted on a secondary basis to service-connected left and right knee joint osteoarthritis.” 25005767 (2025) Denied “Service connection for a low back disorder, including DDD, lumbosacral strain, and lumbar radiculopathy, was denied.” A26009303 (2026) | 58 | 43.1% |
Weight gain or obesity Granted “VA examiner opined back disability less likely than not related to service-connected left knee disability, citing age and obesity.” A25013105 (2025) Denied “Diagnosed back conditions are more likely due to age, obesity, and lack of in-service injury.” 24025475 (2024) | 53 | 18.9% |
Chronic pain Granted “The Veteran claimed his back pain resulted from an antalgic gait caused by his knee pain.” A26005289 (2026) Denied “No functional impairment of earning capacity due to pain” 19156765 (2019) | 35 | 37.1% |
Stress Granted “The Board found that the veteran's service-connected knee and foot conditions caused abnormal biomechanical stressors in the spine, leading to these lumbar conditions.” A24022983 (2024) | 12 | 58.3% |
Based on words in the AI-written summary and reasons for each issue, not a reading of the full decision. 29.4% of the 1,788 issues name at least one medical link; the rest only say “secondary to” the disability. One issue can name several links. Granted is the share of those issues granted (remands count as not granted). A link named in a denial was often the argument the Board rejected.
Why the Board granted or denied intervertebral disc syndrome
Most common reasons in grants
- Caused by the service-connected disability61
- Service connection established31
- Current diagnosis established29
- Aggravated by the service-connected disability21
- VA examiner: less likely than not related to service11
- Criteria for service connection met6
- New and material evidence received to reopen claim4
- New and material evidence received3
Most common reasons in denials
- VA examiner: less likely than not related to service41
- No in-service complaints, treatment or diagnosis37
- Preponderance of the evidence against the claim32
- Service records negative or silent23
- Aggravated by the service-connected disability18
- Caused by the service-connected disability9
- No continuity of symptomatology7
- Continuity of symptomatology since service6
Numbers are decisions that gave the reason. Reasons are short phrases extracted by AI from each decision; common wordings of the same reason are grouped. Benefit of the doubt is reported above.
Recent intervertebral disc syndrome decisions
Granted
Conflicting medical opinions regarding nexus; VA examiner: less likely than not related to knee condition; Private provider: at least as likely as not related to knee condition; Board found private opinion more probative due to rationale and consistency
VA opinion inadequate for failing to address aggravation; Private treatment note persuasive regarding gait changes exacerbating back pain; Veteran testimony supported gait strain on lower back; Evidence in approximate balance, doubt resolved in Veteran's favor
Current disability documented in VA treatment records; Persuasive private medical opinion linking back condition to service-connected knee disabilities; Opinion stated it is more likely than not the back pain is due to in-service injury and knee replacement
Denied
No causal relationship to service or service-connected knee disabilities.; Onset of back pain reported years after service.; No in-service event or diagnosis for back disorder.
Contemporaneous medical evidence more probative than later statements; VA examiner opinions found less likely than not related to service/aggravated by knee disability; Lengthy period between service and symptom onset weighs against claim
Failure to attend VA examination without good cause; Service treatment records silent for back complaints/diagnoses; No evidence of nexus to service or secondary service connection
What VA needs to grant a secondary claim
Secondary service connection means VA disability benefits for a condition caused or made worse by a disability that is already service connected (38 CFR 3.310). The claim needs three things:
- A current diagnosis of intervertebral disc syndrome.
- A knee condition is already service connected.
- Medical evidence linking them (a nexus opinion): intervertebral disc syndrome was caused by a knee condition (3.310(a)), or was made worse beyond its natural progress by it (aggravation, 3.310(b)).
VA's procedures for these claims are in M21-1 V.ii.2.D. When the evidence for and against is about even, VA must decide in the veteran's favor (38 CFR 3.102).
Other conditions secondary to a knee condition
- Major depressive disorder secondary to a knee condition512 decisions · 49.4% granted
- Sleep apnea secondary to a knee condition983 decisions · 46.2% granted
- Osteoarthritis secondary to a knee condition535 decisions · 34.2% granted
- Degenerative arthritis of the spine secondary to a knee condition2,449 decisions · 24.1% granted
- Hip impairment secondary to a knee condition2,665 decisions · 19.0% granted
- Ankle impairment secondary to a knee condition952 decisions · 15.2% granted
- Shoulder impairment secondary to a knee condition426 decisions · 15.0% granted
- Cervical spine limitation of motion secondary to a knee condition396 decisions · 10.6% granted
- Thoracolumbar or lumbar spine limitation of motion secondary to a knee condition636 decisions · 8.6% granted
- Foot impairment secondary to a knee condition445 decisions · 8.3% granted
Intervertebral disc syndrome secondary to other conditions
See all conditions secondary to a knee condition or back conditions as a primary or secondary condition.
Rules that apply to secondary intervertebral disc syndrome claims
- 38 CFR 3.310
Secondary service connection and aggravation
Read it in VA Law Explorer - M21-1 V.ii.2.D
Secondary service connection and aggravation of non-service-connected disabilities
Read it in VA Law Explorer - 38 CFR 3.102
Reasonable doubt (benefit of the doubt)
Read it in VA Law Explorer - 38 CFR 4.71a · DC 5243
Schedule of ratings: musculoskeletal system
Read it in VA Law Explorer - M21-1 V.iii.1.B.3
Spine: evaluating IVDS and incapacitating episodes
Read it in VA Law Explorer - M21-1 V.iii.1.A
Painful motion and functional loss (38 CFR 4.59, DeLuca, Mitchell, Correia)
Read it in VA Law Explorer
Research your intervertebral disc syndrome case
Narrow by year, judge, evidence or secondary condition, read the decisions, and export a research memo.
How these numbers are calculated
- Counts decisions in which the Board decided a intervertebral disc syndrome issue claimed as secondary to a knee condition, by the outcome of that issue.
- The primary disability is read from the decision text ("secondary to …") and grouped by name, so spellings such as "PTSD" and "posttraumatic stress disorder" count together.
- Secondary claims also include aggravation of a non-service-connected condition by a service-connected one (38 CFR 3.310(b)).
- The data comes from CaseScribe's AI extraction of public BVA decisions (2017–2026) and can contain errors. It is updated automatically as new decisions are added.