VA Disability for Knee Conditions: Ratings and Service Connection

Knee problems are one of the most common service-connected disabilities, and for good reason. Years of carrying heavy loads, running on hard surfaces, jumping from vehicles, and repetitive strain take a measurable toll. The VA rates knee conditions in a detailed and sometimes confusing way, but once you understand the structure, you can tell whether your rating reflects your actual limitations.

How the VA rates the knee

Knee conditions are evaluated under the musculoskeletal section of the rating schedule, 38 CFR 4.71a. The two factors that drive most knee ratings are limitation of motion and instability, and they are rated under different diagnostic codes.

Limitation of flexion (Diagnostic Code 5260) measures how far you can bend the knee. The more restricted your bend, the higher the rating, generally ranging from 0 to 30 percent.

Limitation of extension (Diagnostic Code 5261) measures how far you can straighten the knee. Ratings here also climb as the limitation worsens, up to 50 percent in severe cases.

Recurrent subluxation or lateral instability (Diagnostic Code 5257) addresses a knee that gives out or shifts. It is rated at 10, 20, or 30 percent for slight, moderate, or severe instability.

Separate ratings for motion and instability

Here is a point many veterans miss: because limitation of motion and instability describe different problems, the VA can assign two separate ratings for the same knee when both are present. A knee that both bends poorly and gives out can be rated under 5260 (or 5261) and 5257 at the same time. This is one of the few situations where stacking ratings on a single joint is allowed, because it is not considered pyramiding. If you have both symptoms but only received one rating, that is worth a closer look.

Arthritis, meniscus, and other conditions

Degenerative arthritis of the knee (Diagnostic Code 5003) is rated based on limitation of motion, but even when motion loss is minor, X-ray-confirmed arthritis with painful motion typically supports at least a 10 percent rating per major joint. Meniscus conditions, cartilage damage, and knee replacements have their own codes. A total knee replacement, for example, carries a temporary 100 percent rating for a period after surgery, then settles into a minimum rating based on residual symptoms.

Painful motion and the DeLuca factors

A knee can have a near-normal range of motion on paper yet still be disabling because of pain, weakness, fatigue, and flare-ups. Under 38 CFR 4.59 and the principles established in the DeLuca case, the VA is required to consider how pain and repetitive use affect function, not just the raw degrees measured. This is why it matters that your C&P examiner tests your range of motion both before and after repetitive movement and documents flare-ups. If pain limits you to a smaller usable range than the initial measurement suggests, that limitation should be reflected in the rating.

The bilateral factor

If both knees are service-connected, you benefit from the bilateral factor. When you have disabilities affecting paired extremities — both knees, or a knee and an arm, for example — the VA adds an extra 10 percent of the combined value of those ratings before merging them with the rest of your conditions. It is a small but real bump that recognizes the compounded impact of losing function on both sides of the body.

Establishing service connection

To win a knee claim, you need to connect the condition to service. Common pathways include:

• Direct service connection — documented in-service injury, treatment, or complaints of knee pain in your service treatment records.
• Secondary service connection — a knee condition caused or worsened by another service-connected disability. A common example is a knee that breaks down because you favored it after a service-connected injury to the opposite leg, ankle, or back. Altered gait claims are well recognized.
• Aggravation — a pre-existing knee problem that service made permanently worse.

The C&P exam

The knee C&P exam is hands-on. The examiner uses a goniometer to measure your range of motion in degrees, tests stability by manipulating the joint, and asks about pain, swelling, locking, and flare-ups. Describe your symptoms on a bad day and during flare-ups, not just at the moment of the exam. Mention how often the knee gives out, how far you can walk, and what activities you have had to give up. These details give the examiner the information needed to rate you accurately.

How to file

File online at VA.gov, by mail with VA Form 21-526EZ, or through an accredited Veterans Service Officer who can review your records for free. Bring any private orthopedic records, imaging, and a buddy or lay statement describing how the knee affects your daily activities. If your knee has gotten worse since your last rating, you can file for an increase using the same forms.

Common mistakes that lower knee ratings

A few avoidable errors keep veterans from getting the rating their knees deserve. The first is downplaying symptoms at the C&P exam, where a stoic answer of “it’s fine most days” can translate into a low rating. The second is failing to mention flare-ups — if your knee swells, locks, or becomes far more painful after activity, the examiner needs to document the additional loss of function during those episodes. The third is overlooking instability: if your knee buckles or gives way, say so clearly, because instability is rated separately from limitation of motion. Finally, do not assume a single rating is final. Knees tend to degenerate over time, and you can file for an increase when arthritis advances or a replacement becomes necessary.

When a knee keeps you from working

If knee conditions — alone or combined with your other service-connected disabilities — prevent you from holding down steady work, you may qualify for Total Disability based on Individual Unemployability (TDIU), which pays at the 100 percent rate. A veteran whose job required standing, lifting, or walking, and who can no longer do that work because of a bad knee, should consider whether TDIU applies. In rarer cases where the standard rating criteria do not capture an unusual disability picture, an extraschedular evaluation may be warranted, though those claims require strong supporting evidence.

The bottom line

Knee ratings reward detail. Know that motion and instability can be rated separately, make sure painful motion and flare-ups are documented, claim the bilateral factor if both knees are involved, and consider a secondary claim if an altered gait is damaging an otherwise healthy joint. The more precisely your limitations are captured, the closer your rating will track your actual disability.