Knee osteoarthritis can be a disability, but whether it qualifies for benefits depends on which law you’re asking about. Social Security uses one of the strictest tests in federal law and will only approve you if your knees keep you from any substantial work for at least a year. The VA rates service-connected knee arthritis on a sliding scale based on lost range of motion. The Americans with Disabilities Act takes the broadest view and can protect you at work even while you’re still on the job. Your imaging, your treatment history, your age, and your work background usually matter more than the diagnosis itself.
How Social Security Defines Disability
Social Security requires you to be unable to perform any substantial gainful activity because of a medically determinable impairment that has lasted, or is expected to last, at least 12 continuous months or result in death.1Social Security Administration. Part I – General Information – Section: Definition of Disability In 2026, substantial gainful activity means earning more than $1,690 per month.2Social Security Administration. Substantial Gainful Activity Earn above that number and your claim gets denied no matter how bad your knees are.
The word doing the work in that definition is “any.” Social Security isn’t asking whether you can go back to your old job. It’s asking whether any job exists in significant numbers in the national economy that someone with your limitations, age, education, and skills could do. That’s a much higher bar than showing that construction or nursing is off the table.
Meeting the Blue Book Listing for Knee Osteoarthritis
Social Security keeps a directory of impairments called the Blue Book. Match a listing exactly and you’re approved without a vocational analysis. Knee osteoarthritis falls under Listing 1.18, which covers abnormalities of a major joint, and the knee qualifies as a major weight-bearing joint of the lower extremity.3Social Security Administration. 1.00 Musculoskeletal Disorders – Adult
Listing 1.18 requires all four of the following:
- Chronic joint pain or stiffness in the affected knee.
- Abnormal motion, instability, or immobility of the joint.
- Anatomical abnormality confirmed on physical examination (such as contracture or subluxation) or on imaging (such as joint space narrowing, bony destruction, or ankylosis).
- A lasting physical limitation of at least 12 months, plus a documented medical need for a walker, bilateral canes, bilateral crutches, or a wheeled mobility device requiring both hands.3Social Security Administration. 1.00 Musculoskeletal Disorders – Adult
That last piece sinks most knee osteoarthritis claims. Bone-on-bone contact on an X-ray isn’t enough if you walk without a prescribed assistive device. The device has to be medically documented as necessary, not just something you picked up at the drugstore. A doctor’s prescription specifying the type of device and the medical reason you need it is essential.4Code of Federal Regulations. Appendix 1 to Subpart P of Part 404 – Listing of Impairments
After a Total Knee Replacement
If you’ve had a knee replacement, Social Security evaluates you under a different listing, 1.17, which covers reconstructive surgery of a major weight-bearing joint. You have to show a history of the surgery, physical limitations lasting at least 12 months, and a documented medical need for a walker, bilateral canes, bilateral crutches, or a wheeled device requiring both hands.3Social Security Administration. 1.00 Musculoskeletal Disorders – Adult Social Security may delay the decision to allow post-surgical recovery before assessing your long-term function.
What Happens If You Don’t Meet a Listing
Most people with knee osteoarthritis won’t match Listing 1.18 exactly. That doesn’t end the analysis. Social Security then builds a Residual Functional Capacity assessment, which describes the most you can still do despite your limitations. An RFC might conclude you’re limited to sedentary work: sitting for most of the day and occasionally lifting up to 10 pounds, with no extended standing, walking, or carrying.
Once your RFC is set, Social Security applies what practitioners call the grid rules. The grid combines your RFC with your age, education, and work experience to direct a finding of disabled or not disabled. Age carries a lot of weight. A 57-year-old with no transferable skills who is limited to sedentary work is generally found disabled under the grid. A 40-year-old with the same physical limitations and a college degree almost certainly is not.5Code of Federal Regulations. Appendix 2 to Subpart P of Part 404 – Medical-Vocational Guidelines
This is why knee osteoarthritis claims are won and lost on the details in the RFC. Your records need to describe specifically what you can’t do: how long you can stand before needing to sit, how far you can walk, whether you need to elevate your legs, how often pain disrupts your concentration. A chart note that says “patient reports knee pain” doesn’t move the needle.
Medical Evidence That Decides the Claim
The quality of your documentation usually matters more than the severity of your condition. Social Security evaluates musculoskeletal disorders using both imaging and functional evidence.3Social Security Administration. 1.00 Musculoskeletal Disorders – Adult
On imaging, you need X-rays, MRIs, or CT scans that show the actual joint damage: cartilage loss, bone spurs, joint space narrowing, or bony destruction. Normal-looking imaging will sink your claim no matter how much pain you report. If your studies are more than a year old, get updated ones before you file.
Treatment records carry equal weight. Social Security wants to see your medications and how often you take them, the type and frequency of physical therapy, your response to injections or other procedures, and any surgical reports.3Social Security Administration. 1.00 Musculoskeletal Disorders – Adult Records showing you’ve tried multiple treatments without adequate relief matter, because they show the condition isn’t easily controlled.
Gaps in treatment are dangerous. Months without an appointment can read as a sign your condition isn’t as limiting as you say. Consistent care shows whether your functioning is stable, worsening, or improving.3Social Security Administration. 1.00 Musculoskeletal Disorders – Adult If you’ve skipped appointments because you couldn’t afford them, get that reason into the record.
VA Disability Ratings for Knee Osteoarthritis
Veterans with service-connected knee osteoarthritis go through a completely different system. Instead of an all-or-nothing disability decision, the VA assigns a percentage rating based on lost function, and that percentage sets your monthly compensation.
The VA rates degenerative arthritis confirmed by X-ray on how much it limits your range of motion. For the knee, the two main rating codes are DC 5260 for limited flexion (bending) and DC 5261 for limited extension (straightening).6eCFR. Schedule of Ratings – Musculoskeletal System
Flexion ratings for the knee:
- 30% for flexion limited to 15 degrees
- 20% for flexion limited to 30 degrees
- 10% for flexion limited to 45 degrees
Extension ratings for the knee:
- 50% for extension limited to 45 degrees
- 40% for extension limited to 30 degrees
- 30% for extension limited to 20 degrees
- 20% for extension limited to 15 degrees
- 10% for extension limited to 10 degrees
If your range of motion isn’t limited enough to earn a compensable rating under those codes, but X-rays confirm degenerative arthritis with some limited motion, the VA assigns a 10% rating under DC 5003. If X-rays show involvement of two or more major joints with occasional flare-ups, the rating is 20%.6eCFR. Schedule of Ratings – Musculoskeletal System Veterans can receive separate ratings for flexion and extension in the same knee, and secondary conditions caused by the knee problem, such as hip or back issues from an altered gait, may qualify for their own service connection.
Workplace Rights Under the ADA
The Americans with Disabilities Act uses a broader definition than Social Security. Under the ADA, you have a disability if a physical impairment substantially limits one or more major life activities, including walking, standing, lifting, bending, and working. Knee osteoarthritis that makes standing painful or stairs difficult can meet this test even if you’re still working full-time. The condition qualifies even when it’s episodic, so bad days count even if you also have functional days.7Cornell Law School Legal Information Institute. Major Life Activity
The ADA’s employment protections apply to employers with 15 or more employees.8Office of the Law Revision Counsel. 42 USC 12111 Definitions If your employer meets that threshold, they have to provide reasonable accommodations that let you perform the essential functions of your job, unless doing so would create an undue hardship.9U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Reasonable Accommodation and Undue Hardship under the ADA
Practical accommodations for knee osteoarthritis include a stool or chair at a workstation that normally requires standing, an ergonomic setup that reduces strain, modified duties that eliminate heavy lifting or stair climbing, flexible scheduling for medical appointments, or a closer parking space. The process starts with a conversation.9U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Reasonable Accommodation and Undue Hardship under the ADA You don’t have to use the phrase “reasonable accommodation” or cite the ADA by name. Explaining your physical limitation and asking for a change is enough to start the interactive process.