VA Disability Rating for Ankle Instability: DC 5271 and the Evidence (2026)

What Chronic Ankle Instability Is

Chronic ankle instability (CAI) is the persistent giving way, recurrent sprains, and functional limitation that develops in approximately 20 percent of patients after acute ankle sprain. CAI is divided into two overlapping categories: mechanical instability (objective laxity demonstrated by physical examination or stress imaging, typically from injury to the lateral ligament complex - anterior talofibular ligament, calcaneofibular ligament, posterior talofibular ligament) and functional instability (perceived giving way without demonstrable laxity, attributed to deficits in proprioception, neuromuscular control, postural control, and strength).

Most ankle sprains in veterans are inversion injuries that injure the lateral ligaments. Eversion (deltoid ligament) and high (syndesmotic) sprains are less common but can produce more disabling chronic instability. Recurrent sprains accelerate degenerative joint changes including osteochondral lesions, anterior impingement, and post-traumatic ankle osteoarthritis.

How the VA Rates Ankle Instability

Ankle instability is rated under 38 CFR 4.71a using the codes that match the predominant manifestation.

DC 5271 - Limited Motion of Ankle

10 percent: Moderate limitation of motion. 20 percent: Marked limitation of motion. Normal ankle dorsiflexion is 20 degrees, normal plantar flexion is 45 degrees. Limitations are assessed clinically against these baselines.

DC 5270 - Ankylosis of Ankle

20 percent: Plantar flexion less than 30 degrees. 30 percent: Plantar flexion between 30 and 40 degrees, or dorsiflexion between zero and ten degrees. 40 percent: Plantar flexion at more than 40 degrees, or dorsiflexion at more than ten degrees, or with abduction, adduction, inversion, or eversion deformity.

DC 5272 - Subastragalar or Tarsal Joint Ankylosis

10 percent (good weight-bearing position) or 20 percent (poor weight-bearing position).

DC 5274 - Astragalectomy

20 percent for astragalectomy.

Separate Rating for Surgical Residuals

Veterans with ligament reconstruction (Brostrom procedure, modified Brostrom-Gould, anatomic reconstruction with allograft or autograft) or other surgical interventions may receive separate ratings for surgical scars (DC 7800-7805), neuropathic pain, or hardware-related residuals when each produces a ratable manifestation.

DeLuca Factors

38 CFR 4.40 and 4.45 require consideration of functional loss from pain, weakness, fatigability, incoordination, and pain on repetitive use. C&P examinations should document range of motion after three repetitions and during flare-ups.

Diagnosis and Workup

A defensible chronic ankle instability claim is anchored in objective documentation.

Specialist Examination

Examination by an orthopedic surgeon, foot and ankle specialist, or podiatrist documenting the history of recurrent sprains, the perception of giving way, mechanical symptoms, and functional limitations. Provocative tests include the anterior drawer test (assessing anterior talofibular ligament), talar tilt test (assessing calcaneofibular ligament), and external rotation stress (assessing syndesmotic injury).

Stress Radiographs

Stress radiographs with comparison views of the contralateral ankle quantify mechanical laxity. The Telos device or manual stress technique produces standardized stress views. Anterior drawer displacement greater than 10 mm or side-to-side difference greater than 3 mm, and talar tilt greater than 9 degrees or side-to-side difference greater than 3 degrees, indicate mechanical instability.

MRI

Ankle MRI documents lateral ligament injury (acute or chronic), osteochondral lesions of the talar dome, peroneal tendon injury, syndesmotic injury, and degenerative changes. MRI is particularly useful when the clinical picture suggests intra-articular pathology in addition to ligamentous instability.

Functional Testing

Functional testing instruments such as the Cumberland Ankle Instability Tool (CAIT), Foot and Ankle Ability Measure (FAAM), and Ankle Joint Functional Assessment Tool (AJFAT) quantify functional impairment and supplement the rating evidence.

Imaging for Degenerative Changes

Plain radiographs document ankle joint space narrowing, osteophytes, and other degenerative findings consistent with post-traumatic osteoarthritis. CT scan provides additional structural detail when surgical planning is contemplated.

Service Connection Pathways

Ankle instability claims involve several distinct pathways.

Direct Service Connection from In-Service Sprain

Veterans with documented in-service ankle sprain (sick call records, profile, or treatment notes) and continuity of symptomatology can establish direct service connection with a current diagnosis and a medical nexus. The transition from acute sprain to chronic instability is a recognized clinical pathway.

Cumulative Trauma During Service

Repetitive ankle stress from running, marching with heavy loads, parachute landings, and uneven terrain training can produce cumulative ligamentous laxity even without a single landmark injury. Documentation of the service environment supports the cumulative-trauma theory.

Secondary to Other Lower Extremity Conditions

Ankle instability can develop secondary to service-connected knee, hip, or biomechanical conditions that alter gait. Service-connected pes planus, for example, alters ankle biomechanics and contributes to ankle instability.

Aggravation of Pre-Existing Instability

Veterans who entered service with mild ankle laxity that worsened during service can pursue an aggravation theory. The opinion characterizes the baseline severity at entrance and the current severity attributable to service.

Evidence That Strengthens the Claim

Strong ankle instability claims include the following.

Specialist Diagnosis

Diagnosis from an orthopedic surgeon, foot and ankle specialist, or podiatrist documenting the type of instability (mechanical, functional, mixed), the involved ligaments, and any associated intra-articular pathology.

Stress Imaging or MRI

Stress radiographs documenting laxity or MRI documenting ligament injury and any chondral lesions.

Recurrent Sprain Documentation

Treatment records documenting each sprain episode - emergency department visits, primary care visits, immobilization, physical therapy. A frequency log over time supports the chronic instability characterization.

Treatment History

Records of conservative management (functional bracing, peroneal strengthening, proprioception training, balance training), surgical management (Brostrom-Gould or anatomic ligament reconstruction, syndesmotic stabilization), and any post-operative course.

Functional Impact

Statements from the veteran, family, employers, or coworkers documenting the impact on running, walking on uneven surfaces, recreational activities, work, and routine activity. Cumberland Ankle Instability Tool scores or FAAM scores quantify functional impairment.

Service Documentation

Service treatment records documenting the index injury, MOS records demonstrating exposure (infantry, airborne, special operations), and lay statements from fellow service members supporting the in-service injury or cumulative trauma.

Nexus Opinion

For direct or secondary service connection where the link is not obvious, a medical opinion that it is at least as likely as not (50 percent probability or greater) that the chronic ankle instability is related to the documented in-service injury or to a service-connected condition.

Common Rating Issues

Several recurring issues affect ankle instability claims.

Functional vs Mechanical Instability

Functional instability without demonstrable mechanical laxity can still produce significant disability. The rating should reflect functional limitation rather than requiring objective stress test findings, though objective findings strengthen the file.

Range of Motion Documentation

DC 5271 ratings turn on moderate or marked limitation of motion. Examinations that do not document goniometer-based ROM, repetitive motion testing, or flare-up assessment may underestimate severity. Veterans should ensure their treating providers and C&P examinations capture ROM findings consistent with the DeLuca factors.

Separate Ratings for Coexisting Conditions

Osteochondral lesions producing locking or clicking, peroneal tendon dysfunction, post-traumatic ankle osteoarthritis, and surgical residuals can be rated separately when each produces a distinct ratable manifestation. The rater must avoid pyramiding under 38 CFR 4.14.

Bilateral Factor

Bilateral ankle instability invokes the bilateral factor at 38 CFR 4.26, which adds 10 percent of the combined value of the bilateral conditions to the running total before further combining with other ratings.

Related Ratable Conditions

Ankle instability frequently co-exists with other ratable conditions.

Pes Planus

Bilateral pes planus is rated under DC 5276 and frequently coexists with ankle instability through altered hindfoot biomechanics.

Plantar Fasciitis

Plantar fasciitis is rated under DC 5269 and shares biomechanical contributors with ankle instability.

Knee Conditions

Ankle instability alters knee loading and can contribute to or coexist with knee pathology, rated under DC 5256-5263.

Post-Traumatic Ankle Osteoarthritis

Long-standing ankle instability accelerates degenerative changes. Post-traumatic osteoarthritis can be rated separately under DC 5003 (degenerative arthritis) when imaging findings and symptom criteria are met.