Knee Claims Guide

Overview

Knee conditions are among the most commonly claimed VA disabilities, most often rated under DC 5257 (instability), DC 5260 (limited flexion), or DC 5261 (limited extension) within 38 CFR § 4.71a. A large share of the Board's published knee decisions involve a knee that is already service connected, where the real fight is over a higher rating, a separate rating for instability or a torn cartilage, an improper rating reduction, or an effective date, not over whether the knee connects to service in the first place. That means many of the lessons in this guide are about proving how bad the knee is and defending a rating you already have, in addition to the basics of winning service connection.

What a Knee Claim Covers

The VA does not rate "a bad knee" as one thing. It rates specific impairments, each with its own diagnostic code under the musculoskeletal schedule (see 38 CFR § 4.71a). The knee codes you are most likely to see:

• Instability or recurrent subluxation: the knee gives way or slips. DC 5257.
• Limitation of flexion: how far you can bend the knee. DC 5260.
• Limitation of extension: how far you can straighten it. DC 5261.
• Meniscus (semilunar cartilage): a dislocated meniscus with locking, pain, and effusion (DC 5258) or a symptomatic meniscus that was removed (DC 5259).
• Ankylosis: the knee is fused or frozen in one position. DC 5256.
• Tibia and fibula impairment: nonunion or malunion of the lower-leg bones. DC 5262.
• Knee replacement: a prosthetic joint. DC 5055.

How Service Connection Works, At a High Level

If you are still trying to get your knee service connected in the first place, rather than fighting over the rating on a knee that is already connected, you generally need to show three things. This is the same basic test that applies to any VA disability claim, just applied to this joint.

1. A current diagnosis. A doctor identifies a current knee condition, such as arthritis, a meniscus tear, or instability.
2. An in-service event. An in-service injury, disease, or event. Veterans who served in combat can rely on their own credible account of how the injury happened, without needing it separately documented in the service record, under the combat presumption (38 U.S.C. § 1154(b); 38 CFR § 3.304(d)).
3. A medical nexus. A medical opinion connecting the current knee condition to service, or to another service-connected condition for a secondary claim (38 CFR § 3.303; 38 CFR § 3.310).

What VA Looks For: Tests, Records, and Diagnostic Codes

Whether you are establishing service connection or fighting for the right rating, the record VA actually reviews centers on a small set of documents and data points.

• Range-of-motion testing: flexion and extension measured in degrees with a goniometer, tested actively, passively, and while bearing weight, with the opposite knee tested for comparison.
• Instability testing: Lachman, drawer, or varus/valgus laxity findings, or a veteran's own credible account of the knee giving way, buckling, or causing a fall.
• Assistive-device documentation: whether a brace, cane, or walker was prescribed by a medical provider, not just used on your own initiative.
• The diagnostic codes involved: DC 5257 (instability), 5260 (flexion), 5261 (extension), 5258 and 5259 (meniscus), 5256 (ankylosis), and 5055 (replacement).
• The Knee and Lower Leg DBQ, the standardized form an examiner completes documenting all of the above, discussed in more detail later in this guide.

How a Knee Gets Service Connected

Knees often come in pairs and chains: one bad knee overloads the other, and a bad back or ankle overloads both. When both knees are service-connected, they are a paired extremity, so the bilateral factor can add to the combined rating.

Across published DC 5257 decisions, here is how often the Board granted by the legal theory the claim was argued on:

How the VA Rates the Knee

Instability and lost motion are the two ratings most knee claims turn on. Instability (DC 5257) is scored by how much the knee gives way; it does not depend on range of motion.

Range of motion is scored separately, and flexion (bending) and extension (straightening) are two different codes. A normal knee bends to about 140 degrees and straightens to 0.

Other knee codes fill in the rest of the picture:

Why One Knee Can Carry More Than One Rating

This is the part most veterans, and some raters, miss. Because instability and lost motion compensate different problems, the VA's own General Counsel has held they can be rated separately on the same knee. So can limited flexion and limited extension, and so can a meniscal rating alongside either one.

These combine through VA math, not simple addition, and they are not pyramiding, because each pays for a distinct loss. If your rating decision paid only one code for a knee that both gives way and will not bend, that is a common under-rating worth a closer look.

Painful Motion and the 10% Floor

A knee can hurt long before it loses enough motion to reach a 10% row on the table. The rating schedule accounts for that: a joint with painful motion is entitled to at least the minimum compensable rating, generally 10%, even when the measured range of motion is nearly normal (see 38 CFR § 4.59). The VA must also consider how pain, weakness, fatigue, and flare-ups further limit you, not just your best single measurement (DeLuca v. Brown, 8 Vet. App. 202 (1995)).

Evidence That Wins

• Goniometer range-of-motion numbers, in degrees, for flexion and extension, tested active and passive and with weight-bearing, so the rater can place you on the table.
• Objective instability testing (Lachman, drawer, or varus/valgus laxity findings) documenting how much the knee gives way, which is what DC 5257 turns on. Objective testing helps, but it is not required: a veteran's own credible account of the knee giving way, buckling, or causing a fall can support an instability rating on its own, and the Board cannot categorically favor a stability test over that account (English v. Wilkie, 30 Vet. App. 347 (2018)).
• A documented prescription for your brace, cane, or walker, in writing from a medical provider. Using an assistive device on your own is not the same as having one prescribed, and whether a knee earns a higher instability rating often turns on this documentation being in the file.
• A simple log of when the knee gives out, locks, catches, or swells, even without a lab test to back it up. This kind of first-person record supports both the instability rating and a separate meniscal rating.
• Imaging and operative records: X-ray, MRI, or surgical notes showing arthritis, a meniscus tear, or a replacement.
• The Knee and Lower Leg DBQ, which captures range of motion, stability, flare-ups, and the functional loss the rating depends on. See the DBQ guide.
• A nexus for a secondary claim: a medical statement linking the knee to a service-connected back, hip, ankle, or opposite knee. See nexus letters.
• Your own account of flare-ups and give-way, including how often the knee buckles and what it stops you from doing, which supports the DeLuca and instability findings.

Why These Claims Get Denied

Beyond a missing nexus or an undiagnosed condition, a few specific denial patterns show up often enough in the Board's knee decisions to call out on their own.

Common Mistakes

The same handful of missteps account for most lost or under-rated knee claims. Each follows from how the knee codes are scored. Among the Board's classified service-connection denials for the knee, here is what claims most often fell short on:

Do's and Don'ts

A condensed version of everything above, in the order it actually matters when you sit down to build your file.

Common Secondary Conditions

A service-connected knee rarely travels alone. Because it changes how you walk, it drives problems higher up the leg and in the back, and it is itself often secondary to a condition that started elsewhere. Each bar below is the Board's grant rate for DC 5257 in that pairing, with the number of decisions under it. They describe the published record across many veterans, not a prediction about any one claim.

Conditions that can cause a bad knee (knee as the secondary)

Claims where the knee was argued as secondary to an already service-connected condition, most often an altered gait from the back, the hip, or the opposite knee. This is the "ways to connect via another condition" list, and it's usually the easier route into a grant:

Conditions a bad knee can cause (knee as the primary)

Conditions veterans have claimed as caused or aggravated by a service-connected knee, as one overloaded joint wears down the rest of the chain:

Quick Checklist Before You File

Bring these together before you submit anything.

For the mechanics of actually submitting the claim, see the Standard Claim Guide and the Fully Developed Claim Guide (filing with all your evidence up front can speed up the decision).

The Claims Process, Step by Step

Once you file, your claim moves through a series of hand-offs. Understanding who does what helps you know who to contact, and what to expect, at each stage.

1. You file the claim. Directly with VA, through VA.gov, or with the help of an accredited representative.
2. VA acknowledges the claim and assigns it for development. A Veteran Service Representative (VSR) is assigned to gather your service treatment records, VA and private medical records, and any other evidence needed.
3. The VSR orders a Compensation & Pension (C&P) exam if one is needed. Most knee claims require one, especially secondary claims and increased-rating claims, where current range of motion and stability need to be measured.
4. The C&P exam is conducted. By a VA clinician or a contracted examiner, who completes a Knee and Lower Leg Disability Benefits Questionnaire (DBQ) documenting range of motion, stability, flare-ups, and, where relevant, a nexus opinion.
5. The file goes to a Rating Veteran Service Representative (RVSR), the "rater." The rater reviews the complete file, including the exam results, and decides whether service connection is warranted, at what percentage, and whether more than one knee code applies.
6. A senior reviewer may review the decision before it's finalized, depending on the complexity of the claim.
7. VA issues the decision letter. This states whether the claim is granted or denied, the rating percentage or percentages if granted, and the reasons behind the decision.
8. If you disagree, you choose an appeal lane. Higher-Level Review, Supplemental Claim, or a Board appeal, covered later in this guide.

Who's who: VSO vs. VSR vs. Rater vs. C&P Examiner

For the full walkthrough of every stage with more detail, see Inside Your Claim and Claim Stages.

DBQs and Your C&P Exam

The Knee and Lower Leg Disability Benefits Questionnaire (DBQ) is the standardized form an examiner completes for your knee, it structures the exam findings into the specific data points VA's rating schedule requires: range of motion in degrees, active and passive, weight-bearing and non-weight-bearing, instability testing, and flare-up impact. See the DBQ Guide for how these forms work, including whether a private DBQ completed by your own doctor can be submitted instead of relying solely on a VA exam.

Before your C&P exam, bring a clear, specific account of your symptoms: how often the knee buckles or gives out, how far it bends before it hurts, and how flare-ups affect you on your worst days, not just an average day. Be consistent with what's already in your medical records and prior statements. For a full walkthrough of what to expect and how to prepare, see the C&P Exam Prep Guide.

Reading Your Decision Letter, and What to Do If Denied

Your decision letter has two parts: a narrative section explaining the reasoning (often called "reasons and bases"), and a codesheet showing the actual rating percentage or percentages, the effective date, and the diagnostic codes used. See the Reading Your Decision Letter Guide for how to find and interpret each part, or use the Letter Interpreter tool to upload your own letter and get a plain-English breakdown.

If your claim is denied, the rating is lower than you expected, or VA proposes to reduce an existing rating, you have three main lanes:

• Supplemental Claim: refile with new and relevant evidence, such as updated imaging, a new nexus opinion, or treatment records showing the knee is the same or worse. See Supplemental Claim Guide.
• Higher-Level Review (HLR): a senior reviewer looks at the same evidence again for a difference of opinion, no new evidence is added. See HLR Guide.
• Board Appeal: your case goes to a Veterans Law Judge at the Board of Veterans' Appeals, with options for a direct review, an evidence docket, or a hearing. See Board Appeal Guide.

Not sure which lane fits your situation? See the Appeals decision guide for a side-by-side comparison of all three.

After You Win: Maintaining and Defending Your Rating

A grant is not always the end of the story, especially for a knee, where VA periodically reexamines and sometimes proposes to reduce a rating. Keep your treatment consistent: continued follow-up, imaging, and documentation of ongoing symptoms protects you if VA schedules a future reexamination. VA cannot reduce a rating unless the evidence shows the knee has actually improved in your daily functioning, not just on a single exam (38 CFR § 3.344; 38 CFR § 3.105). A reduction that does not follow these rules, or that ignores records showing the knee is the same or worse, can be reversed and the rating restored. Understand when a rating becomes protected from future review (including Permanent and Total status) and what to do if VA proposes to reduce it. See Protect Your Rating and Future Reexaminations for the specifics.

There is also a ceiling on how high combined knee ratings can go: under the amputation rule, all of your ratings for one leg combined cannot exceed the rating for losing the leg at that level (38 CFR § 4.68).

If your knee worsens after the initial grant, you can file for an increased rating. For an earlier effective date tied to a worsening that was already underway, the key is showing when the worsening could first be factually ascertained in the record, not just the date of your exam (38 CFR § 3.400(o)).

Quick Reference Tables

Secondary Connection Pathways

From Filing to Decision: Who Does What

Frequently Asked Questions

Related Tools and Guides

Sources

1. 38 CFR § 4.71a, Diagnostic Codes 5256 to 5263, musculoskeletal ratings (instability, meniscus, flexion, extension, ankylosis, replacement)
2. 38 CFR § 3.303, basic rules for service connection
3. 38 CFR § 3.310, Secondary Service Connection
4. 38 CFR § 3.306, Aggravation of Pre-Service Disability
5. 38 U.S.C. § 1154(b) and 38 CFR § 3.304(d), combat presumption
6. 38 CFR § 4.59, painful motion; 38 CFR § 4.40 and 4.45, functional loss
7. 38 CFR § 4.14, rule against pyramiding
8. 38 CFR § 4.68, the amputation rule (ceiling on combined ratings for one limb)
9. 38 CFR § 3.344 and 3.105, rating reductions
10. 38 CFR § 3.400, effective dates, including 3.400(o) for increased ratings
11. VAOPGCPREC 23-97 and 9-98, separate ratings for instability and limitation of motion on the same knee
12. VAOPGCPREC 9-2004, separate ratings for limited flexion and limited extension on the same knee
13. Lyles v. Shulkin, 29 Vet. App. 107 (2017), a rating under DC 5257 or 5261 does not by itself preclude a separate meniscal rating under DC 5258 or 5259
14. DeLuca v. Brown, 8 Vet. App. 202 (1995), pain, weakness, fatigue, and flare-ups must be considered beyond the raw range-of-motion number
15. Correia v. McDonald, 28 Vet. App. 158 (2016), range of motion must be tested actively, passively, weight-bearing, and non-weight-bearing, with the opposite joint tested for comparison
16. Sharp v. Shulkin, 29 Vet. App. 26 (2017), an examiner must estimate additional functional loss during flare-ups using all available information, not decline to opine solely because the exam did not occur during a flare-up
17. English v. Wilkie, 30 Vet. App. 347 (2018), the Board cannot categorically favor objective stability testing over a veteran's credible lay report of knee instability
18. CCK Law, knee ratings
19. Hill & Ponton, knee pain