Degenerative Arthritis of the Spine Secondary to Knee Limitation of Flexion Claim Guide
Degenerative Arthritis of the Spine (VA diagnostic code 5242) is sometimes claimed as secondary to service-connected Knee Limitation of Flexion (code 5260) under 38 CFR 3.310. We analyzed published Board of Veterans' Appeals decisions on that pairing; here is what they show. It is an encyclopedic reference, not a forecast.
The Numbers, from 1.9M Appeals
We analyzed the Board's published decisions and found degenerative arthritis of the spine (DC 5242) claimed as secondary to knee limitation of flexion (DC 5260) is a small but documented claim pool that wins more often than not once it reaches a merits decision.
How those 115 issues came out
Symptoms Recorded in Granted Back and neck (spine) Decisions
We analyzed 19,827 granted Board decisions involving back and neck (spine) for symptoms named in sentences about the condition (rating-criteria recitations excluded). Descriptive of the published record, what the Board wrote down, not a checklist of what to report.
Detected by phrase-reading the decision text with condition-specific vocabularies. Source: Board of Veterans' Appeals decisions, RateMyVSO analysis.
ICD-10 Diagnosis Codes for Degenerative Arthritis of the Spine
The ICD-10 diagnosis codes most commonly used for DC 5242, Degenerative Arthritis of the Spine (the kind on your medical records, decision letter, or C&P exam report). VA rates the disability and its residuals, not the diagnosis itself, so coding can vary.
What a secondary claim on this pairing needs
Under 38 CFR 3.310 a secondary claim turns on three elements:
- A current diagnosis: a medical diagnosis of degenerative arthritis of the spine (the secondary).
- A service-connected primary: Knee Limitation of Flexion, already service-connected (the primary). A 0% primary still counts.
- A medical nexus: a medical opinion linking the degenerative arthritis of the spine to the knee limitation of flexion, showing the primary caused or aggravated it.
See the Secondary Claim guide for the caused-versus-aggravated split, and the Nexus Letter guide for what makes the medical opinion strong.
Why degenerative arthritis of the spine is claimed secondary to knee limitation of flexion
Whether that medical link exists in any one case is a medical question decided on that case's own evidence (the nexus).
Caused By vs Aggravated By: What the Board Found
The outcome split above counts whole issues. This section goes one layer deeper. Under 38 CFR § 3.310 a secondary claim can be won two ways: the knee limitation of flexion caused the degenerative arthritis of the spine (§ 3.310(a)), or it aggravated an existing degenerative arthritis of the spine (§ 3.310(b)). Every grant rests on one or the other, so the numbers below divide up the granted claims only.
Direct causation is the route that carries most grants here: 87% of them found the knee limitation of flexion caused the degenerative arthritis of the spine, the rest found aggravation. A practical consequence for the nexus opinion: it should address both routes, because a medical opinion that only argues causation leaves the aggravation theory, a separate legal basis, on the table. See the caused-vs-aggravated guide for how the two theories differ.
On the other side: in 8 denied claims the Board looked at this pairing and found no link, meaning it decided the knee limitation of flexion neither caused nor worsened the degenerative arthritis of the spine. That is a separate group from the grants above, counted here so the picture is not one-sided.
We analyzed published Board decisions on this pairing to build this split. The grant split covers granted claims only; denied, remanded, and dismissed claims are not in it. Descriptive of the published record, not a prediction.
What VA Looks For: Tests, Records, and Diagnostic Codes
The record VA actually reviews centers on a small set of documents. We analyzed published Board decisions on these claims and ranked the records that appeared most often:
- A medical nexus opinion: the one record VA weighs most on a secondary claim, a doctor's statement linking your degenerative arthritis of the spine to your service-connected knee limitation of flexion and naming the mechanism.
- Range of motion measured in degrees
- In-service back or neck injury documented
- Flare-ups and additional functional loss addressed
- Radiculopathy or EMG/nerve-conduction findings
- MRI or imaging of the spine
- Physician-prescribed bed rest
The diagnostic code involved: DC 5242 (Degenerative Arthritis of the Spine). The rating levels for this code are in the rating section below.
Records ranked by how often published Board decisions cited them. The exam that captures most of this is covered in the C&P Exam section below. Source: Board of Veterans' Appeals decisions, RateMyVSO analysis.
The Evidence That Wins Degenerative Arthritis of the Spine Secondary Claims
What veterans who win this pairing actually put in the file, and why each piece moves the claim.
- Your knee's medical record, start to finish: Gather every knee exam, X-ray, and range-of-motion measurement from when it was first service-connected to now. VA needs to see your knee problem came first, and your spine problem came later or got worse after.
- Imaging of your low back: Get current X-rays or an MRI of your lumbar spine. This shows the disc narrowing, bone spurs, and joint wear that prove the arthritis is really there and how far it's progressed.
- Physical therapy notes on how you walk: Ask your PT records be pulled or request a note describing your gait, things like limping, leaning to one side, shortening your stride, or favoring the good leg. This is the paper trail showing your body changed the way you move to protect your knee, and that change is what stresses your spine.
- A timeline connecting the two: Write down (or have your doctor confirm) the date your knee limitation started and when your back pain began or got worse. If your knee came first, that order matters a lot to VA.
- Statements from people who've watched you move: Ask your spouse, a friend, or a coworker to write what they've noticed, a limp, trouble standing straight, leaning to one side. This lay evidence fills gaps if you didn't run to the doctor every time your back flared.
- A nexus letter from an orthopedic doctor or spine specialist: This is the single most important document. It should state plainly that it is "at least as likely as not" your spine arthritis was caused by, or made worse by, your knee limitation of flexion. It should name the specific reason why, your knee changed how you walk, threw your hips and spine out of balance, or forced your low back to twist and arch differently to compensate. A doctor who explains the "how" beats one who just checks a box.
- Language that covers both causation and aggravation: Make sure the letter addresses both possibilities, that the knee either caused the spine arthritis from scratch, or made an existing spine problem worse. VA can deny if the letter only covers one and not the other.
- A demand for a real gait exam at your C&P appointment: If your VA exam doctor doesn't watch you walk or measure your back's range of motion, the exam is incomplete for this kind of claim. You can request a new exam and specifically ask that gait be assessed, since a missing gait check is a common reason these claims get denied.
Evidence Cited in Published Back and neck (spine) Decisions
We analyzed 294,193 published Board decisions involving back and neck (spine) for condition-specific evidence, counting only case-specific mentions (boilerplate recitations excluded). "Favorable" is the share of decisions citing that evidence where every issue was granted or the outcome was mixed; the baseline across all these decisions is 45.1%, combining every diagnostic code below. Evidence appearing in a decision does not mean it decided the case. Descriptive of the published record, not a prediction.
By diagnostic code
These codes are grouped together above. They do not perform the same, so find your own code here rather than reading the combined figure. A code retired in the schedule rewrites appears without a link, because its decisions were judged under criteria that no longer apply.
Detected by phrase-reading the decision text with condition-specific vocabularies. Source: Board of Veterans' Appeals decisions, RateMyVSO analysis.
Board Grants on This Pairing, Dissected
The Board has granted service connection for degenerative arthritis or degenerative disc disease of the spine as secondary to a service-connected knee disability in several published decisions. In each case below, the veteran's knee disability affected his gait or biomechanics, and the Board found that this connection to a back condition was at least as likely as not present. Remember, these decisions are not binding on future cases, and every claim is decided on its own record.
Spine arthritis linked to right knee disability Citation A25088278 (October 14, 2025), Evidence Submission docket
The record: The veteran's low back condition had already been service connected in an earlier Board decision as secondary to his right knee disability, and the AOJ implemented that grant with a 40 percent rating. In this later decision, the Board treated that award as a binding favorable finding and used it as the basis to also grant a related claim for radiculopathy in the left leg, which was tied to the same spine condition. The Board pointed to lay statements about occasional leg symptoms and a September 2022 private diagnosis of left sciatic radiculopathy.
Why it won: The Board explained that a prior finding of service connection is binding on later related claims. Once the spine disability was connected to the knee, the Board found the radiculopathy flowing from that same spine disability was also at least as likely as not related, even though a December 2019 VA examiner had found no objective signs of radiculopathy.
Lumbar spine granted, ankle and neck claims denied in the same decision Citation A25071558 (August 25, 2025), Evidence Submission docket
The record: An October 2022 VA examiner diagnosed mild anterolisthesis with facet joint arthropathy, spondylosis, and multilevel disc disease, and noted the veteran "has an antalgic gait." A separate October 2022 VA medical opinion specifically tied that antalgic gait to the veteran's service-connected left knee disability.
Why it won: The Board found the evidence in at least equipoise once it had a VA opinion connecting the antalgic gait itself to the left knee disability, and a diagnosis of a spine disability associated with that gait. The Board resolved reasonable doubt in the veteran's favor and granted the claim, even though it denied related ankle and cervical spine claims in the same decision for lack of a similar gait-based nexus opinion.
Back arthritis tied to left knee disability with the help of lay testimony Citation A25039225 (April 29, 2025), Evidence Submission docket
The record: The file included a February 1984 service treatment record documenting back pain, a December 2014 private examination in which the veteran's own treating physician opined that his "back problems were caused by degenerative joint disease of the knees," and a separate December 2014 private opinion from the same physician linking severe knee disease to the development of disc herniation in the back. The veteran's wife also gave a statement recalling his limp and back trouble beginning at discharge. Three VA opinions from 2016 and 2019 weighed against the claim, attributing the back condition to a later work injury and obesity.
Why it won: The Board gave the treating physician's opinions "highly probative" weight, noting the doctor's personal treatment relationship with the veteran. The Board found the VA opinions less probative because they failed to consider obesity as a possible intermediate step in a chain of causation and, in one case, relied on the absence of service treatment records to support a negative finding, which the Board said was improper. With the private opinions outweighing the VA opinions, the Board resolved doubt in the veteran's favor.
VA examiner's own opinion supports the grant Citation A24085879 (December 23, 2024), Hearing docket
The record: This case returned to the Board after a Court remand. A June 2023 VA examiner, after reviewing the medical records and examining the veteran, opined that his lumbar spine disability was at least as likely as not proximately due to or the result of his service-connected bilateral knee disabilities, and supported the opinion with a clear rationale.
Why it won: The Board found the June 2023 VA examiner's opinion adequate and persuasive because it was based on a review of the record, an in-person exam, and a thorough explanation. With that opinion in the file, the Board found the evidence at least in approximate balance and granted the claim.
Private opinion citing gait studies overcomes VA opinions that ignore the literature Citation A24053334 (September 5, 2024), Direct Review docket
The record: An August 2020 VA examiner found no evidence that "compensatory walking strategies" from the knee condition caused back pain. A January 2021 private opinion countered that the severity of the veteran's service-connected left knee pathology caused an antalgic gait and shift in center of gravity, and cited "numerous studies" addressing how gait changes from knee problems affect the spine. A February 2021 VA examiner claimed no medical literature supported such a relationship, and a September 2021 VA examiner gave a conclusory opinion with no rationale.
Why it won: The Board found the VA opinions not probative because they claimed there was no supporting medical literature when the private opinion had, in fact, cited such literature, and because the VA opinions only addressed causation, not aggravation. The private opinion's explanation of an altered center of gravity impacting the back was found persuasive, so the Board granted the claim.
Why VA Denies, and How the Board Answered
The rationales below are the ones VA examiners actually used against this pairing in the published record, each paired with the Board's response.
- Read the left column first: if a VA opinion in your file uses one of these arguments, that is the reasoning your own evidence has to meet.
- The right column is the counter: it shows how the Board actually answered that argument, with the decision cited.
- A rationale appearing here is not a verdict: the same argument won some cases and lost others, on different records.
| VA examiner's rationale | How the Board answered it |
|---|---|
| The veteran did not have a limp or abnormal gait, so there was no basis to link the knee disability to the back condition, either by causation or by aggravation (19156744). | The Board accepted this rationale as adequate and persuasive. It found the VA examiner's opinion, based on a review of the file and a physical exam, more probative than the veteran's own lay belief that the conditions were connected, and denied the claim (19156744). |
| The veteran's service treatment records showed only two isolated episodes of low back pain, without any further complaints in service after either episode (19156744). | The Board found these were "acute processes" that resolved, not the start of a chronic condition. It noted the absence of any similar complaint after service for more than 30 years and found this inconsistent with a claim of continuous symptoms, so it denied both direct and secondary service connection (19156744). |
| A private nurse practitioner opined that knee damage generally causes compensatory back strain, and cited medical literature to support the theory (A23028397). | The Board found the opinion speculative because it repeatedly used words like "can" and "may," and found that the nurse practitioner did not actually discuss the studies she cited. The Board noted one cited article's title actually suggested the opposite direction of causation. The opinion was found not probative, and the claim was denied (A23028397). |
| No VA examination was ever provided for the lumbar spine secondary theory (A23028397). | The Board found that a VA exam was not required because the veteran did not raise the secondary theory until after the rating decision on appeal, and the record at that time did not indicate an association between the back condition and a service-connected disability. The claim was denied without a remand for a new exam (A23028397). |
If Granted: How Degenerative Arthritis of the Spine Is Rated
The VA assigns one of these percentages based on what your medical record documents. Plain-language summary of the rating criteria at 38 CFR; the controlling text is the regulation itself.
| Rating | What the record has to show for DC 5242, Degenerative Arthritis of the Spine |
|---|---|
| 100% | Your entire spine has fused together in a bad position that severely limits your ability to move your back and neck (unfavorable ankylosis means the bones have grown together abnormally). This complete fusion makes it extremely difficult or impossible to bend, twist, or turn your spine in any direction, significantly impacting your daily activities and quality of life. |
| 50% | Your entire middle and lower back spine has fused together in a way that severely limits your movement and function. Unfavorable ankylosis means the vertebrae (spine bones) have grown together abnormally, creating a rigid, inflexible spine that significantly restricts your ability to bend, twist, or move your back normally. |
| 40% | You qualify for this rating if your entire neck is fused or locked in place in a bad position (unfavorable ankylosis), or if you can only bend forward 30 degrees or less in your mid to lower back, or if your entire mid to lower back is fused in a good functional position (favorable ankylosis). Ankylosis means your spine joints have become stiff and immobile, either naturally from your condition or surgically fused together. |
| 30% | You qualify for this rating if your neck can only bend forward 15 degrees or less (normal is about 50 degrees), or if your entire neck spine has fused together in a good position (favorable ankylosis means the bones have grown together but in a way that doesn't cause major problems). This represents severe limitation in neck movement that significantly restricts your ability to look down or bend your head forward. |
| 20% | You qualify for this rating if your back or neck injury limits how far you can bend forward - either bending your back forward between 30-60 degrees or bending your neck forward between 15-30 degrees. You also qualify if your overall spine movement is significantly restricted (back movements totaling 120 degrees or less, neck movements totaling 170 degrees or less), or if you have severe muscle spasms that cause you to walk abnormally or develop visible spine curvature like a hunched back, loss of natural back curve, or sideways spine curvature. |
| 10% | You qualify for this rating if your spine injury limits how far you can bend forward - either to about shoulder height for your lower back or chin-to-chest level for your neck. You also qualify if you have muscle spasms, stiffness when moving (guarding), or tender spots along your spine that don't cause you to walk differently or change your spine's normal curves. Additionally, you qualify if X-rays show a vertebral fracture where the bone has collapsed by half or more of its original height. |
Do's and Don'ts
Every item below comes from a pattern in the decisions on this pairing, not from general claim advice.
- Ask for an opinion that covers aggravation, not just causation: Several denials turned on VA opinions that only asked whether the knee "caused" the back condition and never addressed whether it made an existing back condition worse.
- Point to documented gait changes: In more than one grant, a VA or private examiner specifically tied an antalgic gait or altered center of gravity from the knee to the back condition. This connection helped the claim succeed.
- Get an opinion from a doctor who has actually treated you: The Board gave "highly probative" weight to opinions from a veteran's own longtime private physician in more than one grant.
- Back up literature citations with real explanation: A private opinion that cited studies but did not explain how they applied to the facts was found not probative in a denied case.
- Get lay statements from family who saw you right after service: A spouse's statement recalling a limp and back trouble at discharge helped support continuity of symptoms in one grant.
- Don't rely on an opinion that only rules out causation: If the opinion never discusses aggravation, the Board has found it incomplete and remanded or denied the claim.
- Don't let long treatment gaps go unexplained: Decades between an in-service back complaint and the first post-service diagnosis was used against a claim when there was no explanation for the silence.
- Don't submit a conclusory private opinion: An opinion using words like "can" or "may" without a clear rationale tying the cited literature to the veteran's specific facts was found not probative.
- Don't expect an exam without some record support: If the file does not already suggest a link between the back condition and a service-connected disability, the Board found no error in VA's decision not to schedule an exam.
- Don't assume a normal gait finding will be overlooked: Examiners who found no limp or weight-shifting used that finding to rule out a knee-to-back connection, and the Board has accepted that reasoning.
Quick Checklist Before You File
- Service connection already in place for Knee Limitation of Flexion, and a current medical diagnosis of degenerative arthritis of the spine.
- Diagnostic testing, imaging, or clinical records documenting the degenerative arthritis of the spine, whatever your provider used to diagnose and track it.
- A nexus opinion, whenever possible from a doctor familiar with degenerative arthritis of the spine, stating it is at least as likely as not caused or aggravated by the knee limitation of flexion, and naming the mechanism rather than just the conclusion.
- Lay statements: spouse, family, friends, or battle buddies describing what they've witnessed or noticed.
- Your STRs and any VA opinions already in the file on either condition. If a VA opinion already went against you, your submitted opinion or statement should address its specific reasoning.
For the mechanics of filing itself, see the Standard Claim Guide and the Fully Developed Claim Guide.
The Claims Process, Step by Step
A secondary claim moves through the same pipeline as any other. Understanding who does what helps you know who to contact and what to expect.
- You file the claim, naming Knee Limitation of Flexion as the service-connected primary and degenerative arthritis of the spine as secondary. Directly with VA, through VA.gov, or with an accredited representative's help.
- VA assigns a Veteran Service Representative (VSR) to develop the claim: gather your service treatment records, VA and private medical records, and order a C&P exam if needed.
- The C&P exam is conducted, usually with the examiner asked to address the specific secondary theory (causation and aggravation both).
- The file goes to a Rating Veteran Service Representative (RVSR), the "rater," who weighs the medical evidence and decides service connection and, if granted, the rating percentage.
- VA issues the decision letter stating the outcome and the reasoning.
- If denied or under-rated, you choose an appeal lane, Supplemental Claim, Higher-Level Review, or a Board appeal, covered below.
Who's who: VSO vs. VSR vs. Rater vs. C&P Examiner
Your VSO
An accredited representative, agent, or attorney. Not a VA employee. Helps prepare and file, and can represent you on appeal. Has no authority to decide your claim.
VSR
VA staff who develops the claim: gathers records and schedules the exam. Does not decide the rating.
Rater (RVSR)
VA staff who reviews the complete file and makes the actual decision on service connection and percentage.
C&P Examiner
Conducts the exam and, where asked, gives a nexus opinion. Does not decide the claim, but the opinion's reasoning and legal framing carry real weight.
For the full walkthrough, see Inside Your Claim and Claim Stages.
DBQs and Your C&P Exam
A Disability Benefits Questionnaire (DBQ) is the standardized form the examiner completes for your condition. See the DBQ Guide for how these forms work and whether a private DBQ from your own doctor can be submitted instead of relying solely on a VA exam. For what to expect and how to prepare, see the C&P Exam Prep Guide, and be specific about how your degenerative arthritis of the spine symptoms relate to your knee limitation of flexion timeline, treatment, and any aggravation, that is the detail a nexus opinion relies on.
Reading Your Decision Letter, and What to Do If Denied
Your decision letter has a narrative "reasons and bases" section and a codesheet with the rating and effective date. See the Reading Your Decision Letter Guide or use the Letter Interpreter tool to decode your own letter. If denied, you have three main lanes:
- Supplemental Claim: refile with new and relevant evidence, such as a nexus opinion that addresses the mechanism and the specific VA rationale you're rebutting. See Supplemental Claim Guide.
- Higher-Level Review (HLR): a senior reviewer looks at the same evidence again, useful if the denial rested on a legal error. See HLR Guide.
- Board Appeal: your case goes to a Veterans Law Judge, with a direct review, evidence, or hearing docket. See Board Appeal Guide.
Not sure which lane fits? See the Appeals decision guide for a side-by-side comparison.
After You Win: Maintaining Your Rating
Keep documentation of ongoing treatment, follow-up evaluations, and any updated diagnostic testing for your degenerative arthritis of the spine on file, this protects you if VA schedules a future reexamination. See Protect Your Rating for when a rating becomes protected and Future Reexaminations for what triggers one. If your degenerative arthritis of the spine worsens, see the Rating Increase Guide.
Frequently Asked Questions
Does Knee Limitation of Flexion have to be highly rated to support a degenerative arthritis of the spine secondary claim?
No. 38 CFR 3.310 looks at whether the service-connected Knee Limitation of Flexion caused or aggravated the degenerative arthritis of the spine, not at how severe the Knee Limitation of Flexion rating is. Even a 0% service-connected primary can anchor a secondary claim.
What do the percentages on this page mean?
They are the historical outcomes of 115 published Board decisions on this exact pairing: 29% granted, 22% denied, 50% remanded. They describe decided appeals already on record. They do not predict what would happen in any individual case.
RateMyVSO. Educational resource. Not affiliated with the U.S. Department of Veterans Affairs. Not legal advice. All RateMyVSO tools are free. Find a VSO representative for personalized guidance.