Leg Length Discrepancy (Post-Surgical) Secondary to Hip Injury / Hip Replacement (Total Hip Arthroplasty)

Yes. Under 38 CFR § 3.310(a), any disability proximately caused or chronically worsened by a service-connected condition is itself service-connected. Leg Length Discrepancy (Post-Surgical) is a documented secondary pairing for Hip Injury / Hip Replacement (Total Hip Arthroplasty) with strong 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 Leg Length Discrepancy (Post-Surgical) separately under its own 38 CFR Part 4 diagnostic code, then combines it with Hip Injury / Hip Replacement (Total Hip Arthroplasty) 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 Leg Length Discrepancy (Post-Surgical) as secondary to Hip Injury / Hip Replacement (Total Hip Arthroplasty) is rated strong. Total hip arthroplasty (THA) and significant hip injuries that alter joint architecture frequently produce iatrogenic or injury-related leg length discrepancy (LLD). Prosthetic component sizing, femoral offset changes, and acetabular cup positioning during THA commonly result in discrepancies of 5–20 mm, which may be intentional (to achieve soft-tissue tension) or inadvertent. Even small LLD (<10 mm) alters gait mechanics — the longer limb pronates excessively and absorbs increased ground reaction force, while the shorter limb develops a compensatory equinus posture. Biomechanical consequences of persistent LLD include ipsilateral lateral knee compartment overloading, contralateral hip abductor overload, lumbar scoliotic posturing with facet arthrosis, sacroiliac joint dysfunction, and trochanteric bursitis. Functional LLD from hip abductor weakness post-THA produces similar mechanical consequences.

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.