Knee arthritis can qualify as a disability, but whether it does depends on which system you’re applying through and how severely it limits your ability to work or perform daily activities. There is no single yes-or-no answer. Social Security, the VA, the Americans with Disabilities Act, and private insurance policies each define “disability” differently and evaluate knee arthritis using different criteria.
How Social Security Evaluates Knee Arthritis
Social Security disability benefits (SSDI and SSI) use one of the strictest definitions. Your knee arthritis must prevent you from working at a level the SSA calls “substantial gainful activity,” and the limitation must last or be expected to last at least 12 continuous months.
The SSA evaluates knee arthritis under Listing 1.18, which covers abnormalities of major joints. The knee is specifically named as a major joint of the lower extremity. To meet this listing, you need to show all four of these elements:
- Chronic joint pain or stiffness
- Abnormal motion, instability, or immobility of the knee
- Anatomical abnormality confirmed on physical exam or imaging, such as joint space narrowing, bony destruction, or contracture
- A physical limitation lasting at least 12 months plus a documented medical need for a walker, bilateral canes, bilateral crutches, or a wheeled mobility device requiring both hands
That fourth requirement is where most people’s claims get complicated. If your knee arthritis is painful and limits your mobility but you can still walk without a walker or bilateral canes, you won’t meet Listing 1.18 directly. That doesn’t mean you’re automatically denied, though. It means the SSA evaluates your claim a different way.
What Happens If You Don’t Meet the Listing
When knee arthritis doesn’t meet a specific listing, the SSA assesses your “residual functional capacity,” which is the most you can still do in a work setting despite your limitations. This assessment looks at whether you can sit, stand, walk, and lift for a full eight-hour workday, five days a week.
Sedentary work, the least physically demanding category, still requires the ability to sit for roughly six hours and stand or walk for up to two hours in an eight-hour day. If your knee arthritis prevents even that, your occupational options shrink dramatically. The SSA then factors in your age, education, and work history to decide whether any jobs exist that you could realistically perform. Someone over 50 with limited education and a history of physical labor has a stronger case than a younger person with transferable office skills.
If you need a cane or other assistive device for one leg but can still use your hands, the SSA may find that sedentary jobs remain available to you. The key question is always whether your knee arthritis, combined with everything else in your medical picture, leaves you unable to sustain any type of work on a regular and continuing basis.
VA Disability Ratings for Knee Arthritis
The VA system works very differently from Social Security. Instead of an all-or-nothing determination, the VA assigns a percentage rating based on how much function you’ve lost. Knee arthritis ratings are based primarily on how far you can bend and straighten your knee.
For limited bending (flexion), the ratings are:
- 0%: Bending limited to 60 degrees
- 10%: Bending limited to 45 degrees
- 20%: Bending limited to 30 degrees
- 30%: Bending limited to 15 degrees
For limited straightening (extension), the scale goes higher because losing the ability to straighten your leg is more functionally severe:
- 0%: Straightening limited to 5 degrees short of full
- 10%: Limited to 10 degrees short
- 20%: Limited to 15 degrees short
- 30%: Limited to 20 degrees short
- 40%: Limited to 30 degrees short
- 50%: Limited to 45 degrees short
If X-rays confirm degenerative arthritis but your range of motion loss doesn’t reach a compensable level, you can still receive a 10% rating for each affected major joint with confirmed painful motion. If two or more major joints are involved with occasional severe flare-ups, that can bump to 20%. Veterans can also receive separate ratings for limitation of flexion and extension in the same knee if both are affected, which can increase overall compensation.
Workplace Protections Under the ADA
The Americans with Disabilities Act uses a broader definition of disability than either Social Security or the VA. Under the ADA, knee arthritis qualifies as a disability if it substantially limits a major life activity. Walking, standing, bending, and lifting all count as major life activities, and the law says “substantially limits” should be interpreted broadly.
This means knee arthritis doesn’t need to be totally disabling to trigger ADA protections. If it meaningfully restricts your ability to walk or stand compared to most people, you’re likely covered. The ADA also protects people with a record of such a limitation or who are perceived as having one, so even arthritis that’s currently well-managed could qualify.
ADA protection doesn’t mean you receive a check. It means your employer must provide reasonable accommodations unless doing so would cause undue hardship. For knee arthritis, practical accommodations from the Job Accommodation Network include:
- Sit-stand workstations so you can alternate positions throughout the day
- Modified break schedules to stretch or walk when stiffness sets in
- Ergonomic or adjustable chairs
- Remote work options where you can sit, stand, or move freely
- Restructured job duties to reduce or eliminate lifting, pushing, or pulling
- Reassignment of marginal tasks like carrying or moving heavy objects
You don’t need to disclose your diagnosis to coworkers, but you do need to inform your employer that you need an accommodation and provide medical documentation if requested.
Private Disability Insurance Claims
If you carry long-term disability insurance through your employer or a private policy, knee arthritis can qualify for benefits, but the definition of “disabled” in your policy matters enormously. Most policies use one of two standards, and many switch between them over time.
“Own occupation” coverage asks whether you can perform the specific duties of your regular job. If you’re a construction worker, warehouse employee, or nurse whose job requires prolonged standing and walking, knee arthritis that prevents those activities could qualify you for benefits even if you could theoretically do a desk job. “Any occupation” coverage asks whether you can perform any job suited to your education, training, and experience. Many policies start with own-occupation coverage for the first one to two years, then switch to the any-occupation standard, which is significantly harder to meet.
Insurers frequently challenge knee arthritis claims. Common tactics include having a doctor who has never examined you review your records and declare you capable of sedentary work, using surveillance footage of you carrying a grocery bag as evidence you can work full-time, or interpreting gaps in your treatment as signs of improvement. If your policy shifts to any-occupation and the insurer identifies sedentary jobs you could theoretically perform, your benefits may be terminated even if your knee hasn’t improved.
What Documentation You Need
Regardless of which system you’re applying through, the strength of your claim depends on medical evidence. X-rays showing joint space narrowing, bone spurs, or bony destruction are foundational. MRI results can add detail about cartilage loss and soft tissue damage. Your doctor’s notes documenting pain levels, range of motion measurements, gait abnormalities, and the use of any assistive devices carry significant weight.
What often makes or breaks a claim isn’t the diagnosis itself but the documented functional limitations. Arthritis confirmed on imaging paired with notes showing you can only walk one block, can’t climb stairs, or need a cane is far more persuasive than imaging alone. Consistent treatment records matter too. Long gaps between appointments can be interpreted as evidence that your condition isn’t as limiting as you claim, even if the real reason is that treatment wasn’t helping or you couldn’t afford it.
For Social Security claims specifically, your medical records need to cover a continuous 12-month period showing persistent limitations. For VA claims, you need evidence linking your current knee condition to your military service, whether through service medical records, a doctor’s opinion on the connection, or both. If you’re filing for an increased VA rating because your arthritis has worsened, current medical evidence showing the decline is essential.