Plantar Fasciitis / Heel Pain Secondary to Ankle Injury (Instability, Sprain, Arthritis)

Yes. Under 38 CFR § 3.310(a), any disability proximately caused or chronically worsened by a service-connected condition is itself service-connected. Plantar Fasciitis / Heel Pain is a documented secondary pairing for Ankle Injury (Instability, Sprain, Arthritis) with moderate medical evidence. A nexus letter from a qualified physician linking the two conditions is the most reliable way to establish this connection.

The gold standard is a private nexus opinion stating — to at least a 50% probability ("at least as likely as not") — that the secondary condition was caused or aggravated by the primary service-connected condition. Peer-reviewed medical literature supporting the physiological mechanism strengthens the nexus. Treatment records documenting the onset or worsening of the secondary condition in temporal relation to the primary are supporting evidence.

The VA rates Plantar Fasciitis / Heel Pain separately under its own 38 CFR Part 4 diagnostic code, then combines it with Ankle Injury (Instability, Sprain, Arthritis) and all other service-connected ratings using the combined ratings formula under § 4.25. The formula applies the whole-person concept: a 50% combined existing rating plus a new 30% rating yields 65% (rounded to 70%), not 80%.

38 CFR § 3.310(a) states: "Disability which is proximately due to or the result of a service-connected disease or injury shall be service connected." The aggravation variant under § 3.310(b) applies where the primary condition permanently worsens a pre-existing disability beyond its natural progression. Both standards require a showing of nexus — a medical or scientific link between the primary condition and the secondary.

The medical evidence supporting Plantar Fasciitis / Heel Pain as secondary to Ankle Injury (Instability, Sprain, Arthritis) is rated moderate. Ankle instability and post-traumatic ankle arthritis alter foot and ankle biomechanics in ways that directly stress the plantar fascia. Chronic lateral ankle instability produces excessive subtalar pronation as the foot compensates for compromised ankle lateral ligament support; this pronation flattens the medial longitudinal arch, increasing tensile strain on the plantar fascia origin at the medial calcaneal tubercle. Additionally, post-traumatic ankle arthritis restricts dorsiflexion, forcing a compensatory early heel rise during gait that significantly increases plantar fascia load (measured at 1–3 times body weight at toe-off). EMG and force plate studies confirm that restricted ankle dorsiflexion — a universal consequence of ankle arthritis — is the strongest biomechanical predictor of plantar fascial overload.

The VA will not solicit nexus evidence on your behalf for secondary claims. In practice, a written nexus opinion from a private physician or independent medical examiner is essential — the VA's Compensation & Pension (C&P) examiner is not required to produce a favorable nexus opinion, and the VA has discretion to weigh competing opinions. Submitting a private nexus letter at the time of filing is the most reliable strategy.