Knee — Limitation of Flexion (Including Patellofemoral Syndrome)

1. What This Condition Is

Limitation of flexion means your knee cannot fully bend. The technical measurement is how many degrees of flexion remain when you try to curl your leg toward your body. Normal knee flexion is approximately 0 to 140 degrees. Veterans lose flexion range from traumatic knee injuries, cartilage damage, ligament injuries, post-surgical scarring, and degenerative changes that accumulate over years of rucking, running, jumping, and carrying load. Patellofemoral syndrome, where the kneecap tracks incorrectly along the femur, is a common cause of anterior knee pain with reduced flexion and is seen frequently in veterans who performed high-impact physical training. This condition affects your ability to kneel, climb stairs, get up from a chair, and walk on uneven terrain.

2. VA Rating Criteria

Limitation of flexion is rated under 38 CFR § 4.71a, Diagnostic Code 5260. The rating is based entirely on how far you can flex the knee, measured in degrees with a goniometer during your C&P exam.

The maximum rating under DC 5260 is 30%. However, you may receive separate ratings for limitation of extension (DC 5261), lateral instability (DC 5257), meniscal conditions (DC 5258, 5259), or any other separately ratable knee pathology on the same knee. These are not pyramiding violations when each rating reflects a distinct functional loss. See 38 CFR § 4.71a, note following DC 5261.

Under 38 CFR § 4.59 and 38 CFR § 4.40, painful motion and functional loss also count. If your knee flexion is technically within a higher range but causes pain that limits function, the VA is required to consider that in the rating. In Correia v. McDonald (Fed. Cir. 2016), the court confirmed that the VA must account for pain on motion and functional loss, not only raw range-of-motion measurements.

Patellofemoral syndrome is typically rated under DC 5260 or DC 5257 (recurrent subluxation or lateral instability of the patella), depending on your primary symptom. Get imaging and orthopedic notes that specify the diagnosis and its functional impact.

3. What to Expect at Your C&P Exam

The examiner will ask you to bend and straighten your knee while they measure range of motion with a goniometer. They will record the number of degrees you can flex. They will then ask you to repeat the motion several times to test for fatigability and additional loss of motion under repetitive use, per 38 CFR § 4.40.

Expect questions about pain during movement, pain at rest, swelling, locking, giving way, and difficulty with stairs, squatting, or kneeling. If you have patellofemoral syndrome, the examiner may perform a patellar grind test and check for crepitus.

The examiner will review your imaging. X-rays showing joint space narrowing, osteophytes, or cartilage loss support the diagnosis. An MRI showing cartilage damage or tracking abnormalities strengthens a patellofemoral claim.

Do not minimize your symptoms at the exam. Walk the way you actually walk. Do not push through pain to demonstrate flexion you cannot sustain in daily life. The examiner measures your functional range, not your maximum possible effort on a good day.

4. Evidence You Need to Win

Diagnosis: A current diagnosis of knee limitation of flexion, patellofemoral syndrome, or underlying knee pathology from a physician or orthopedic specialist. Imaging reports (X-ray, MRI) naming the structural cause are important.

Nexus Letter: Your private orthopedic physician or VA-accredited examiner needs to state that your current knee condition is at least as likely as not related to your in-service activity or injury. This means citing 38 CFR § 3.303 for a direct service connection and identifying the in-service event: a fall, jump, MVC, bearing load over years of infantry service, or a documented training injury.

DBQ Form: VA Form 21-0960M-9 (Knee and Lower Leg DBQ). If your treating provider completes this with specific degree measurements for flexion and extension and documents pain on motion, it directly maps to the rating criteria.

Range of Motion Documentation: Ask your treating provider to document your actual range of motion in degrees, note that it was taken after repetitive use, and note whether pain limits motion below the measured endpoint.

Buddy Statements: Have someone who sees you daily describe what they observe: you cannot kneel at your child's level, you hold the wall going down stairs, you sit at the end of the pew because you cannot bend your knee to fit in the row. Specific, observed behaviors carry weight. Use VA Form 21-10210 (Lay/Witness Statement) or a signed written statement.

Personal Statement: Write a statement in your own words describing daily limitations. Reference specific activities you have stopped or modified. This is your lay evidence under 38 CFR § 3.303(a).

5. Secondary Conditions to Consider

Hip Conditions: When a knee does not track or flex properly, the hip compensates. Over time, this compensation causes hip pain and degenerative changes. File hip conditions secondary to service-connected knee pathology under 38 CFR § 3.310.

Lumbar Spine Strain: Altered gait from a painful or limited knee places asymmetric load on the lumbar spine. Degenerative changes in the lumbar spine are a recognized downstream consequence.

Ankle and Foot Conditions: The same altered gait mechanics that stress the hip and spine also affect ankle alignment and plantar fascia loading. Plantar fasciitis and ankle strain often develop in the limb opposite the injured knee as well.

PTSD and Depression: Chronic pain from knee conditions is a documented contributor to depression, sleep disruption, and worsening PTSD symptoms. If you have a PTSD claim, document how your physical limitations interact with your mental health.

Obesity (as an aggravating factor): Not a separately ratable secondary condition, but relevant to your claim narrative. If reduced activity from knee pain has led to weight gain that worsens knee loading, document that cycle in your personal statement.

6. Common Mistakes That Kill Claims

Performing maximum flexion at the exam when daily function is less. The rating reflects your actual functional range, not your ability to push through pain once in a clinical setting. 38 CFR § 4.40 requires the VA to rate the condition as it presents on a bad day and under repetitive use, not your single best effort.

Not testing after repetitive use. The regulation at 38 CFR § 4.40 requires consideration of fatigability. If you do not mention that your range worsens after walking a block or after 10 repetitions at the exam, the examiner may not test it. Ask the examiner directly: "Can we retest after a few repetitions?"

Missing separate conditions on the same knee. If you have both limited flexion and lateral instability or a meniscal tear, those are separately ratable under DC 5260 and DC 5257 or DC 5258. Filing only one leaves ratings on the table.

Not documenting the in-service event. Pull your service treatment records. Find any note about knee pain, a fall, a training injury, or an MVC. If nothing is documented, write a personal statement describing what happened. Lay evidence is accepted under 38 CFR § 3.303(a).

Accepting a single-knee rating without filing the other side. If you favor the injured knee and your opposite knee begins to deteriorate, that secondary knee condition may be ratable under 38 CFR § 3.310. Do not ignore it.

7. FWD Assist Resources

The FWD Assist Back, Knee, and Joint Guide covers the full musculoskeletal rating system, including how DC 5260 interacts with other knee diagnostic codes and how to build a multi-condition knee claim. The FWD Assist C&P Exam Prep Guide walks you through exactly what to say and do at a musculoskeletal exam, including the repetitive use language that often makes the difference between 10% and 20%. The FWD Assist Secondary Conditions Guide explains the 38 CFR § 3.310 pathway for filing hip, back, and ankle claims downstream of a service-connected knee.

All books are available at fwdassisthq.com.

8. Get Help Without a Claim Shark

Free help is available through VSOs like the DAV, VFW, American Legion, and Disabled American Veterans. Your county veterans service officer (CVSO) can file and manage your claim at no charge. VA-accredited agents and attorneys can also represent you.

Anyone charging you upfront fees before an initial VA decision is violating federal law under 38 USC § 5905. VA-accredited attorneys and agents are only permitted to charge after an initial VA decision, capped at 20% of past-due benefits awarded. No legitimate representative asks for money before your first decision.

Find VA-accredited representatives at va.gov/ogc/accreditation.asp.