Two veterans can present with an identical range-of-motion reading and receive very different ratings. The difference is function - and the regulations that govern it are the most underused part of most knee claims.
The rating schedule for the knee does not measure a joint. It measures a veteran: how far the knee moves, how much it takes to get there, how quickly it fails, and what it does under real-world use.
The functional-loss framework: 38 CFR 4.40 and 4.45
Two general policy sections of the rating schedule apply to every musculoskeletal rating. 38 CFR 4.40 - disabling effects of pain, weakness, fatigability, and incoordination - requires the examiner to estimate how far the veteran could move without severe pain, and to consider the disability from the point of view of the veteran working. 38 CFR 4.45 adds weakened movement, inaccurate movement, excess movement, excess fatigability, and impaired coordination to the list of functional losses that must be considered.
In plain terms: a knee that moves fully but does so with severe pain, gives out under load, or fatigues after a few repetitions is not a normal knee, and the schedule says so explicitly.
38 CFR 4.55 - the special considerations
38 CFR 4.55 tells raters that certain considerations apply to joints: weakened movement, instability of the joint, impaired nutrition, and a low threshold for pain. For knees, instability is the standout - it is both a general consideration here and a standalone criterion under Diagnostic Code 5257.
38 CFR 4.59 - painful motion
38 CFR 4.59 provides that with any joint disability, painful motion contributes to functional loss, and the minimum evaluation for painful motion is 10 percent even where the arc of motion itself is noncompensable. The rule only operates, however, when the record documents the painful arc and the effect on the veteran's life and work.
The examiner is required to describe the affected range and the functional loss during flare-ups and after repeated use over time - which is where most knee exams fall short.
Where veterans start
Every case is different, and there is no obligation at any step. When veterans want to understand what their records actually support, these are the two most common starting points:
- Medical records review
A licensed physician reviews your records for a $250 flat fee and identifies which knee conditions the available evidence may support. The fee is refunded in full if nothing supportable is identified.
- Nexus letter
When the records support one, a licensed provider writes the medical opinion that addresses the link between your knee condition and your service or an already service-connected disability.
The three range-of-motion readings
Court decisions - DeLuca v. Brown, Mitchell v. Shinseki, and Sharp v. Shulkin - establish what a valid musculoskeletal exam must contain. The examiner must address:
- Initial range of motion measured on the exam table
- Range of motion after repetitive use over the period of the exam
- Range of motion during a typical flare-up - or a statement explaining why it cannot be tested
What this means for your exam
Before the C&P exam, write down - concretely - what a flare-up looks like and what happens after repeated use. How far can you walk before the knee swells? How many stairs can you climb before pain stops you? How often does the knee give way, and what does the giving way cost you - falls, near-falls, avoiding stairs entirely?
Our knee C&P exam guide walks through the examination itself, and the knee ratings guide shows how each measurement converts to a percentage.
Documenting flare-ups between exams
Flare-up documentation should not live only in your memory. Treatment notes that describe exacerbations, a personal statement describing typical bad days and their frequency, and lay statements from family members who observe the limitation all give the examiner and rater something to work with. Our personal statement guide covers how to write one that carries weight.
Why this matters most for knees
Knees are the joint where guarding most distorts the measurement. A veteran who pushes through severe pain produces a better goniometer reading and a worse claim - the schedule itself instructs examiners to account for the pain a veteran could reasonably be expected to endure. Describing where severe pain begins, honestly and specifically, is not exaggeration; it is the exact information the regulations require the examiner to capture.
Frequently asked questions
Does painful motion guarantee a 10 percent knee rating?
38 CFR 4.59 sets 10 percent as the minimum evaluation whenever motion of a joint is painful, even when the range itself would otherwise be noncompensable. The record must document both the pain and the functional loss that accompanies it.
Can I be rated on my worst days, not just the exam-day measurement?
Yes. The examiner is required to describe functional loss during flare-ups and after repeated use over time, not only the range measured at rest on the exam table. Court precedent requires the examiner to address all three, or explain why they cannot be tested.
What is repeated use over time?
The VA defines it as the number of times a veteran can perform the movement within a period of time, over however long the exam takes. It is meant to capture fatigue and increasing pain that a single resting measurement misses.
My range of motion is normal. Can I still get a rating?
Often yes. Painful motion alone supports a 10 percent minimum, and instability under Diagnostic Code 5257 is rated on giving way rather than range. Both depend on documentation, not just the goniometer reading.