Knee Instability VA Disability Rating: Criteria, Evidence & Pay

What is knee instability and how does it affect veterans?

Knee instability — clinically described as recurrent subluxation or lateral instability — occurs when the ligaments that hold the knee joint together are damaged or stretched, allowing the joint to shift or give way during movement. The knee has four primary ligaments: the anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), medial collateral ligament (MCL), and lateral collateral ligament (LCL). Damage to any of these can cause instability.

Military service frequently causes knee ligament injuries and instability. ACL and MCL tears are common in service members from running, jumping, pivoting during training, parachute landings, dismounted operations over rough terrain, and direct trauma. Even without a complete ligament tear, years of repetitive stress can stretch and weaken the ligaments to the point where the knee becomes chronically unstable. Many veterans also develop instability after meniscal injuries or knee surgery during service.

Knee instability profoundly affects daily functioning. The knee may give way without warning — on stairs, walking on uneven ground, pivoting, or simply standing. This creates a constant risk of falls and secondary injuries. Veterans with knee instability often develop a guarded, cautious gait, consciously or unconsciously trying to protect the unstable knee. This altered walking pattern frequently leads to problems in the opposite knee, hips, and lower back.

The unpredictability of an unstable knee also takes a psychological toll. The fear of the knee giving out during normal activities creates anxiety and limits what veterans are willing to do, contributing to social isolation and depression.

VA diagnostic code for knee instability

Recurrent subluxation or lateral instability of the knee is rated under Diagnostic Code (DC) 5257 per 38 CFR § 4.71a, Schedule of Ratings — Musculoskeletal System.

Critical point: DC 5257 is rated on instability alone, not on limitation of motion or arthritis. This means it can be — and should be — rated separately from limitation of motion codes (DC 5260 for flexion, DC 5261 for extension) per VAOPGCPREC 23-97 and VAOPGCPREC 9-04. If your knee has both instability and limited motion, you are entitled to separate ratings for each distinct impairment.

Other knee diagnostic codes that may apply alongside DC 5257:

• DC 5260 — Limitation of flexion (0%, 10%, 20%, 30%)
• DC 5261 — Limitation of extension (0%, 10%, 20%, 30%, 40%, 50%)
• DC 5258 — Dislocated semilunar cartilage (meniscus) with locking, pain, and effusion (20%)
• DC 5259 — Removal of semilunar cartilage, symptomatic (10%)
• DC 5003 — Degenerative arthritis confirmed by X-ray (10% or 20%)

Rating criteria for knee instability (DC 5257)

The VA rates recurrent subluxation or lateral instability at three compensable levels based on severity:

0% rating

Criteria: Instability has been diagnosed and service-connected but does not meet the criteria for slight instability on objective testing.

Monthly payment: $0 (but establishes service connection)

What this looks like: You have a history of knee ligament injury and occasional subjective feelings of instability, but physical examination does not demonstrate clinically measurable laxity. Service connection is established, protecting you if the condition worsens.

10% rating — Slight instability — $180.42/month

Criteria: Slight recurrent subluxation or lateral instability.

What this looks like: Physical examination reveals mild (1+) laxity on stability testing. Your knee occasionally shifts or feels like it might give way, particularly during activities like descending stairs, walking on uneven surfaces, or pivoting. You may wear a knee brace for added stability during physical activity. The instability is present but does not cause frequent falls or severely limit your daily routine.

20% rating — Moderate instability — $356.66/month

Criteria: Moderate recurrent subluxation or lateral instability.

What this looks like: Physical examination shows moderate (2+) laxity. Your knee gives way more frequently — during routine walking, standing from a seated position, or navigating stairs. You likely wear a knee brace regularly, not just during exercise. You’ve experienced falls or near-falls due to the knee buckling. The instability noticeably limits your activities and may affect your ability to perform certain types of work.

30% rating — Severe instability — $552.47/month

Criteria: Severe recurrent subluxation or lateral instability.

What this looks like: Physical examination demonstrates severe (3+) laxity. Your knee gives way frequently during routine daily activities. Walking is unreliable without a brace or assistive device. You’ve experienced multiple falls. The knee may partially dislocate (sublux) during normal movements. This level of instability severely limits mobility and makes many jobs impossible. You may require a cane or crutch in addition to a brace.

What evidence do you need?

Service records

• Service treatment records documenting knee ligament injuries — ACL/MCL/PCL/LCL tears, sprains, or strains
• Operative reports for any in-service knee surgery (reconstruction, repair)
• Line of duty determinations for knee injuries
• DD-214 showing MOS involving high-risk activities (airborne, infantry, special operations)
• Physical profiles or duty limitations for knee instability
• Records of knee brace prescriptions during service

Medical evidence

• MRI showing ligament damage, laxity, or post-surgical changes
• Physical examination findings from stability testing (Lachman, anterior/posterior drawer, varus/valgus stress tests)
• Orthopedic evaluation documenting the degree of instability (slight, moderate, severe)
• Treatment records documenting ongoing instability symptoms
• Records of knee brace prescriptions and use
• Documentation of falls or injuries resulting from the knee giving way
• Physical therapy records addressing instability and strengthening

Nexus letter

A medical opinion connecting your knee instability to military service. The letter should reference specific service events — a training injury, parachute landing, sports injury during PT, or combat-related trauma — that damaged the knee ligaments. If instability developed gradually from repetitive stress, the letter should explain how cumulative service demands weakened the ligament structures.

Buddy statements

Statements from fellow service members who witnessed the original knee injury or can describe the physical demands that caused it. Statements from family and friends describing episodes of the knee giving way, falls they’ve witnessed, the need for braces or assistive devices, and how the instability limits your daily activities and participation in family events.

Personal statement

Describe the original injury or onset of instability, how often your knee gives way, what activities trigger buckling episodes, any falls or injuries from the knee giving out, what braces or devices you use, and how instability limits your work and daily life. Be specific — frequency of episodes per week or month, activities you avoid, and situations where you feel unsafe.

C&P exam tips for knee instability

What the examiner evaluates

• Ligament stability testing: anterior drawer, posterior drawer, Lachman test, varus stress (lateral stability), valgus stress (medial stability)
• Degree of laxity graded as 1+ (slight), 2+ (moderate), or 3+ (severe)
• Evidence of recurrent subluxation (partial dislocation)
• Use of assistive devices (brace, cane, crutch)
• Gait assessment for guarding or compensatory patterns
• History of falls or giving-way episodes
• Functional impact on daily activities and employment

How to prepare

1. Report every giving-way episode. Before the exam, think through how often your knee gives out or feels unstable. Keep a log if possible — how many times per week or month, what you were doing, whether you fell.
2. Bring your knee brace. If you wear a brace, bring it and wear it to the exam. The examiner should document your use of assistive devices. Explain when and why you wear it.
3. Don’t brace or tighten your knee during testing. During stability tests, try to relax your leg muscles. If you unconsciously guard by tightening your thigh muscles, the examiner may not detect the full extent of laxity.
4. Describe the worst episodes. Tell the examiner about the worst times your knee has given out — on stairs, carrying something, walking on uneven ground. Describe any falls and resulting injuries.
5. Mention separate motion limitation. If your knee also has limited range of motion, make sure the examiner documents both instability AND range of motion findings. These can be rated separately under different diagnostic codes.
6. Explain employment impact. If knee instability limits what work you can do — standing, walking, climbing, carrying — explain this clearly.

Common mistakes

• Guarding (tensing the muscles) during stability testing, which masks the true degree of laxity
• Not reporting the frequency and circumstances of giving-way episodes
• Forgetting to bring or mention knee brace use
• Not asking the examiner to also evaluate range of motion for potential separate ratings
• Minimizing the impact of instability on daily activities and employment
• Failing to mention falls or near-falls caused by the knee giving way

Common secondary conditions linked to knee instability

Knee instability frequently causes or worsens other conditions:

• Back pain — Altered gait from an unstable knee changes spinal mechanics. Limping, guarding, and compensatory movement patterns place abnormal stress on the lumbar spine.
• Opposite knee — Favoring the unstable knee overloads the other one. If your left knee is service-connected for instability, you can claim the right knee as secondary to the altered gait pattern.
• Hip conditions — The same compensatory gait that affects the back also stresses the hips, frequently causing hip pain and accelerated degeneration.
• Depression and anxiety — Chronic pain, fear of falling, loss of mobility, and inability to participate in physical activities significantly increase the risk of mental health conditions.
• Arthritis — Knee instability accelerates cartilage wear and joint degeneration. An unstable knee develops degenerative arthritis faster than a stable one because the abnormal movement patterns grind down cartilage unevenly.

How to calculate your monthly payment

Your total VA disability payment depends on your combined rating across all service-connected conditions. Remember that knee instability (DC 5257) can be rated separately from limitation of motion (DC 5260/5261), meaning a single knee can receive multiple ratings. If both knees are affected, each is rated independently, and bilateral conditions receive a bilateral factor boost.

Use our VA disability calculator to:

• Calculate your combined rating including separate instability and motion limitation ratings
• See how VA math handles multiple ratings for the same joint and bilateral conditions
• Estimate your monthly payment including dependents

For the full breakdown of payment amounts at every rating level, see our 2026 VA disability pay rates page.

Disclaimer: This content is for informational purposes only and does not constitute legal or medical advice. For personalized guidance on your VA disability claim, consult a VA-accredited Veterans Service Organization (VSO), attorney, or claims agent. You can find accredited representatives at VA.gov.