Hip Conditions Secondary to Back and Knee Disabilities

One of the most commonly missed VA claims is the hip that went bad because something else already was. A veteran is service connected for a knee, favors it for fifteen years, and the opposite hip wears out. Nobody files for the hip, because it was never injured in service.

Under 38 CFR 3.310 that hip is compensable anyway, if the record establishes the connection.

What secondary service connection requires

Three elements, and the third is where these claims are won or lost.

• A service-connected primary disability - a rated back, knee, ankle, or foot condition
• A current diagnosed hip condition - arthritis, labral tear, bursitis, impingement, or a strain pattern
• Medical evidence that the primary disability caused or aggravated the hip condition, with reasoning

Aggravation matters as much as causation. Where a hip condition existed already and a service-connected disability made it measurably worse, the VA compensates for the degree of aggravation. That is a lower bar than proving the service-connected condition started the hip problem.

Hip secondary to a knee condition

This is the classic altered-gait claim. A painful or unstable knee changes stride length, stance time, and pelvic rotation. Over years, the opposite hip absorbs load it was not built for, and the contralateral hip degenerates faster than the ipsilateral one.

The strongest version of this claim has an observed antalgic gait in the clinical record, imaging showing asymmetric hip changes, and an opinion that explains the biomechanics. Our knee series covers the primary condition, including knee conditions secondary to the back and hip, which is the same mechanism running the other direction.

Hip secondary to a lumbar spine condition

A service-connected lumbar spine disability affects the hip in two distinct ways, and they call for different opinions. Mechanically, reduced lumbar motion and paraspinal guarding change pelvic tilt and hip loading. Neurologically, radiculopathy produces pain in the buttock and lateral thigh that is often mistaken for a hip problem, and weakness in the hip abductors that destabilizes the joint.

Distinguishing the two is important. Radicular pain radiating from the spine is rated as a neurological manifestation of the spine disability, not as a separate hip condition, and claiming it as both risks a pyramiding denial under 38 CFR 4.14. Our back series covers the spine ratings and radiculopathy.

Hip secondary to a foot or ankle condition

Plantar fasciitis, pes planus, an ankle fusion, or a foot deformity all change the gait at its foundation, and the hip sits at the top of that chain. These claims work the same way as knee-based claims and are evidenced the same way. Our feet and lower legs series covers the primary conditions.

What a strong opinion looks like

The opinions that fail simply assert that the knee caused the hip. The opinions that work explain the mechanism in clinical terms: the specific gait deviation documented in the record, the altered loading it produces at the hip, the time course over which degeneration would be expected, and why that explanation fits this veteran's imaging better than age alone.

It also has to address the alternatives. Body weight, occupation, civilian sports, and age will all be raised, and an opinion that ignores them is easy for a VA examiner to discount. Our guide to what a nexus letter is describes the format, and our medical evidence guide covers which records support it.

Where to go next

See the hip rating code guide for the percentages a successful secondary claim would produce, and nexus letters and increased ratings for how an added rating claim is supported. The evidence guide covers what to gather.

Documenting the mechanism over time

Secondary hip claims are strongest when the record shows a progression, not just a current snapshot. A knee condition rated years ago, followed by treatment notes over time that mention favoring the leg, a cane or brace prescription, and eventually hip pain and imaging changes, tells a consistent story that an opinion can reference point by point.

Veterans who suspect a secondary hip problem but have not yet had it evaluated should get that evaluation on the record as soon as possible rather than waiting. An examiner who can compare current findings to years of documented gait changes has far more to work with than one looking at a single visit.

Aggravation ratings and the baseline finding

When a hip condition existed before the service-connected disability worsened it, the VA is required to establish a baseline level of severity for the hip before the aggravation began, and then rate only the increase attributable to the service-connected condition. This can be more complicated to document than straightforward causation, because it depends on records from before the aggravating condition became severe.

Pre-existing imaging, earlier treatment notes, or even a credible history of the hip being asymptomatic before the primary condition worsened can help establish that baseline. Without it, the VA may have difficulty separating what portion of the current hip impairment is actually connected to the service-connected disability.

Why these claims are commonly overlooked

Veterans tend to file for the joint that was actually injured and stop there, especially when the secondary joint developed slowly and without a clear triggering event. A hip that quietly worsens over a decade of favoring a bad knee rarely feels like something to file a claim about, because there is no single moment to point to.

That gradual pattern is exactly what 38 CFR 3.310 is designed to address. The absence of a dramatic onset does not weaken a secondary claim; what matters is whether the medical evidence in the file can trace the mechanical connection between the two joints over the period involved.