Chronic Ankle Instability
High incidence of ankle sprains and chronic lateral ankle instability from military training, load carriage, and uneven terrain.
38 CFR diagnostic codes 5270, 5271, 5272, 5274
Peer-reviewed evidence (5)
The verified studies behind a Chronic Ankle Instability claim — each links to its real PubMed or DOI record. These are sources our nexus drafts can draw from; none are invented.
- Goodrich E, Vopat B, Herda A. Treatment of Chronic Ankle Instability in the Military Population: A Systematic Review. Foot Ankle Spec. 2024;17(3):208-215. PMID:34991374. doi:10.1177/19386400211068239.
- Orr JD, Robbins J, Waterman BR. Management of chronic lateral ankle instability in military service members. Clin Sports Med. 2014;33(4):675-92. PMID:25280616. doi:10.1016/j.csm.2014.06.011.
- Rhon DI, Greenlee TA, Cook CE, Westrick RB, Umlauf JA, Fraser JJ. Fractures and Chronic Recurrence are Commonly Associated with Ankle Sprains: a 5-year Population-level Cohort of Patients Seen in the U.S. Military Health System. Int J Sports Phys Ther. 2021;16(5):1313-1322. PMID:34631252. doi:10.26603/001c.27912.
- Goodrich E, Morris B, Hermanns C, Herda A, Tarakemeh A, Vopat B. Epidemiology of Ankle Sprain in the Active-Duty Military Population. JBJS Rev. 2022;10(6). PMID:35679429. doi:10.2106/JBJS.RVW.21.00232.
- Cameron KL, Owens BD, DeBerardino TM. Incidence of ankle sprains among active-duty members of the United States Armed Services from 1998 through 2006. J Athl Train. 2010;45(1):29-38. PMID:20064045. doi:10.4085/1062-6050-45.1.29.
Controlling law
The CFR sections and cases the theories relevant to this condition rest on — the legal standard raters evaluate against, never a prediction about any claim.
Direct (§ 3.303)
Regulation
38 C.F.R. § 3.303
Direct service connection — a current disability linked to service. (Continuity of symptomatology under § 3.303(b) is limited by case law to the § 3.309(a) chronic diseases — Walker.)
Case law
Shedden v. Principi, 381 F.3d 1163 (Fed. Cir. 2004)
The three-element test: current disability, in-service event, and a nexus between them.
Holton v. Shinseki, 557 F.3d 1363 (Fed. Cir. 2009)
Federal Circuit restatement of the same three direct-service-connection elements.
Caluza v. Brown, 7 Vet. App. 498 (1995)
The evidentiary framework a rater weighs each element against.
Walker v. Shinseki, 708 F.3d 1331 (Fed. Cir. 2013)
Continuity of symptomatology (§ 3.303(b)) is available ONLY for a chronic disease listed in § 3.309(a); any other condition must use the medical-nexus pathway.
Davidson v. Shinseki, 581 F.3d 1313 (Fed. Cir. 2009)
A categorical 'a medical opinion is always required for nexus' is legal error — competent lay evidence can suffice.
Jandreau v. Nicholson, 492 F.3d 1372 (Fed. Cir. 2007); Layno v. Brown, 6 Vet. App. 465 (1994)
A veteran is competent to report symptoms they personally observe (Layno), and lay evidence can even establish a simple diagnosis in the right case (Jandreau).
McLendon v. Nicholson, 20 Vet. App. 79 (2006)
A LOW threshold — evidence that merely indicates a nexus MAY exist obligates VA to provide a C&P exam.
38 U.S.C. § 5107(b); Gilbert v. Derwinski, 1 Vet. App. 49 (1990)
When the evidence is in relative equipoise, the tie goes to the veteran — the preponderance must be AGAINST the claim to deny it.
Build your Chronic Ankle Instability documentation
Generate and review your full document package free — grounded in sources like these, then routed to a licensed provider to review and sign.
Generate your documentation — freeEducational information about the evidentiary standard — not legal or medical advice, and never a prediction about any claim.