What Are Knee Injuries in VA Claims?

Knee injuries are among the most frequently claimed musculoskeletal conditions in the VA disability system. The VA rates knee conditions under several diagnostic codes in 38 CFR § 4.71a, with the most common being Diagnostic Code 5260 (limitation of flexion), Diagnostic Code 5261 (limitation of extension), and Diagnostic Code 5257 (recurrent subluxation or lateral instability).

Military service is extraordinarily hard on knees. Running with heavy loads, road marches, airborne operations, kneeling behind cover, climbing in and out of vehicles, and years of high-impact physical training all contribute to knee deterioration. Infantry, airborne, armor, and combat engineer MOSs are among the highest-risk for knee injuries, but any veteran who completed basic training subjected their knees to more stress than most civilians experience in a lifetime.

Knee conditions can be claimed as direct service connection (injury during service), aggravation (pre-existing condition worsened by service), or secondary service connection. Secondary knee claims are extremely common — veterans with service-connected back, hip, or ankle conditions often develop knee problems due to altered gait patterns. If a service-connected condition changes how you walk, your knees absorb the compensatory stress.

How the VA Rates Knee Conditions

Knee ratings are unique in the VA system because multiple diagnostic codes can be applied to the same knee simultaneously. This is one of the most important things to understand about knee claims.

Limitation of Flexion (DC 5260) — how far you can bend your knee: 0% — Flexion limited to 60 degrees 10% — Flexion limited to 45 degrees 20% — Flexion limited to 30 degrees 30% — Flexion limited to 15 degrees Normal knee flexion is 140 degrees.

Limitation of Extension (DC 5261) — how far you can straighten your knee: 0% — Extension limited to 5 degrees 10% — Extension limited to 10 degrees 20% — Extension limited to 15 degrees 30% — Extension limited to 20 degrees 40% — Extension limited to 30 degrees 50% — Extension limited to 45 degrees Normal knee extension is 0 degrees (fully straight).

Instability (DC 5257) — knee gives way or feels unstable: 10% — Slight recurrent subluxation or lateral instability 20% — Moderate recurrent subluxation or lateral instability 30% — Severe recurrent subluxation or lateral instability

The critical point: You can receive separate ratings for the same knee. Under VAOPGCPREC 23-97 and VAOPGCPREC 9-98, the VA must assign separate ratings for limitation of motion and instability when both are present in the same knee. A veteran can receive a 10% rating for limited flexion AND a 10% rating for instability in the same knee — that's two separate ratings from one knee.

Additionally, limitation of flexion and limitation of extension can be rated separately under VAOPGCPREC 9-04 if both are compensable. This means one knee can theoretically carry three separate ratings.

DeLuca factors apply. Pain on motion, fatigue, weakness, lack of endurance, and incoordination must be considered. If your knee flexion is 50 degrees on a good day (non-compensable) but drops to 40 degrees during a flare-up (10% criteria), the flare-up limitation should be used.

Meniscal conditions (DC 5258/5259): A dislocated semilunar cartilage (torn meniscus) with frequent episodes of locking, pain, and effusion is rated at 20%. Removal of semilunar cartilage with symptomatic residuals is rated at 10%.

What Happens at Your Knee C&P Exam

The knee C&P exam is one of the most measurement-driven exams in the VA system. The examiner will use a goniometer to measure exact degrees of motion. Understanding what they measure helps you prepare.

Range of motion testing: The examiner will measure flexion (bending the knee) and extension (straightening the knee) in degrees. They must test both active range of motion (you move it) and passive range of motion (they move it) per Correia v. McDonald (2017). They must also test weight-bearing and non-weight-bearing range of motion.

Pain on motion: The examiner must note where pain begins during motion. If you feel pain starting at 30 degrees of flexion even though you can push to 50 degrees, tell the examiner exactly where the pain starts. The pain-limited range is what matters for your rating.

Stability testing: The examiner will perform Lachman's test, anterior/posterior drawer tests, and varus/valgus stress tests to assess ligament stability. If your knee gives way, clicks, catches, or feels unstable, describe these symptoms specifically. The examiner needs to document instability to assign a separate DC 5257 rating.

Flare-up assessment: Under Sharp v. Shulkin (2017), the examiner must estimate additional functional limitation during flare-ups. Be specific: "During a flare-up, I can barely bend my knee past 20 degrees. I can't go up or down stairs. I can't squat. They happen 2-3 times per week and last a full day."

Meniscal testing: McMurray's test and joint line tenderness to assess meniscal damage. If you've had meniscal surgery, bring the operative report.

Common mistakes: Taking anti-inflammatory medication before the exam that temporarily reduces swelling and improves range of motion. Not mentioning instability or giving way episodes. Not describing flare-ups in specific functional terms. Demonstrating full range of motion without mentioning that it causes significant pain. Not reporting that you use a knee brace.

Medical Studies Supporting Knee Injury Service Connection

The medical literature strongly connects military service with knee conditions:

Load carriage research has documented that repetitive carrying of heavy military loads causes accelerated wear on knee cartilage and ligaments. Studies in the American Journal of Sports Medicine have found that soldiers carrying loads exceeding 25% of body weight during prolonged marches show significantly elevated rates of meniscal tears and cartilage degradation compared to age-matched civilians.

Airborne and jump injury studies have demonstrated that parachute landing falls generate impact forces of 5-7 times body weight on the knee joints. Research following airborne-qualified veterans shows dramatically elevated rates of meniscal tears, ACL injuries, and early-onset osteoarthritis compared to non-airborne veterans.

Running-related knee injury research documents that the high volume of running required in military training — often on hard surfaces with boots and additional weight — accelerates patellofemoral syndrome and cartilage wear. Studies have found that military recruits develop knee pain at rates 2-4 times higher than age-matched civilian runners.

Compensatory gait studies are critical for secondary claims. Research published in the Journal of Orthopaedic Research has demonstrated that altered gait patterns from hip, back, or ankle injuries redistribute mechanical forces to the contralateral knee, causing accelerated deterioration. This directly supports secondary service connection claims.

Documents You Need for a Knee Claim

Knee claims benefit significantly from detailed documentation:

Personal Statement: Describe the specific activities, injuries, or cumulative stress that caused your knee condition during service. Include your MOS, specific incidents (falls, jumps, carrying heavy loads), and how the pain has progressed. Describe your current limitations in functional terms — can you climb stairs, kneel, squat, run, stand for extended periods?

Current Imaging: MRI or X-ray results showing meniscal tears, ligament damage, cartilage loss, or osteoarthritis. Current imaging is often the single strongest piece of evidence for a knee claim. If you haven't had imaging recently, request it from your VA provider before filing.

Service Treatment Records: Any sick call visits, profiles, or limited duty orders for knee pain during service. Even one notation strengthens the claim substantially.

Nexus Letter: A medical opinion connecting your current knee condition to service. The doctor should explain how military activities caused or accelerated the knee deterioration beyond what normal aging would produce.

Buddy Statements: Fellow service members who witnessed the injury or can describe the physical demands you endured together.

Employment Records: If knee pain has caused you to miss work, modify duties, or change careers, this evidence supports a higher rating by demonstrating occupational impairment.

Knee Injury Secondary Conditions

Knee conditions commonly cause or contribute to several secondary conditions:

Opposite Knee: When one knee is injured, the other compensates. Over time, the "good" knee deteriorates from carrying extra load. This is one of the most commonly successful secondary claims.

Hip Conditions: Altered gait from a knee injury changes hip biomechanics. Research supports the connection between knee injuries and ipsilateral and contralateral hip deterioration.

Lower Back Pain: Compensatory gait patterns from knee injuries stress the lumbar spine. Veterans who limp or avoid bending one knee place asymmetric loads on their spine.

Ankle Conditions: Similar biomechanical compensation — an injured knee changes ankle loading patterns.

Depression and Anxiety: Chronic pain and loss of physical capability frequently lead to mental health conditions. The inability to exercise, play with children, or perform basic activities takes a significant psychological toll.

Obesity / Weight Gain: Knee injuries limit exercise capacity, leading to weight gain that further stresses the joints and can trigger secondary conditions like sleep apnea and diabetes.

Filing for the opposite knee as secondary to the service-connected knee is one of the highest-value secondary claims available — it's well-supported by medical literature and commonly granted.