VA Knee Ratings: Limitation of Motion, Instability, and DeLuca

Knee claims are among the most common and most misunderstood ratings in the VA system. Veterans often walk out of a C&P exam with a 10% rating for a knee that is, on most days, far more disabling than the rating reflects. The reasons are well-documented in case law: the rating schedule allows separate evaluations for instability, limitation of motion, and functional loss, but examiners frequently capture only one.

The knee diagnostic codes

Knee conditions are rated under several diagnostic codes in 38 C.F.R. § 4.71a. The most-used:

• DC 5257 — Other impairment of the knee (recurrent subluxation or lateral instability). 10% slight, 20% moderate, 30% severe.
• DC 5258 — Cartilage, semilunar, dislocated, with frequent episodes of "locking," pain, and effusion. 20%.
• DC 5260 — Limitation of flexion of the leg. 0% (flexion to 60°), 10% (45°), 20% (30°), 30% (15°).
• DC 5261 — Limitation of extension of the leg. 0% (extension to 5°), 10% (10°), 20% (15°), 30% (20°), 40% (30°), 50% (45°).
• DC 5256 — Ankylosis of the knee. 30% favorable, up to 60% extremely unfavorable.
• DC 5055 — Knee replacement. 100% for one year post-op, then minimum 30%.

The key principle: DC 5257 stacks with limitation of motion

VA General Counsel Opinions VAOPGCPREC 23-97 and 9-2004 established that a single knee can receive separate ratings under DC 5257 (instability) and DC 5260 or 5261 (limitation of motion) because they evaluate different functional losses. This is the single most missed rating opportunity in knee claims.

If your knee gives out, locks, or feels unstable AND you have meaningful limitation of motion AND the examiner has documented both, the rating should combine both. A decision that grants only one when the evidence supports both is appealable.

DeLuca and Mitchell — the snapshot problem

Knees are particularly affected by the DeLuca / Mitchell rule. A knee examined cold, having sat in a waiting room for 30 minutes, often has more range of motion than the same knee after a half-mile walk, a flight of stairs, or a flare. The examiner is required to elicit and document:

• Range of motion before and after three repetitions.
• Pain on motion and where in the arc pain begins.
• Estimated functional loss during flares.
• Use of an assistive device (brace, cane, crutch).

The rating must consider the additional loss during flares, not just the cold-knee measurement. Mitchell v. Shinseki (Vet. App. 2011) held that mere pain in the arc of motion is not enough — there has to be actual functional impairment for the rating to climb under DeLuca, but estimated flare-day loss is recognized.

Instability — how the examiner tests for it

The Knee DBQ asks the examiner to test for:

• Anterior instability (Lachman test).
• Posterior instability (posterior drawer).
• Medial-lateral instability (varus/valgus stress).

Each is graded 1+ (mild), 2+ (moderate), or 3+ (severe). The grade maps to DC 5257's 10%/20%/30% scale. Veterans whose knee gives way at home but tests stable in the clinic often miss the instability rating because the in-clinic test is negative. Personal accounts of give-way episodes, falls, and brace use are competent lay evidence that VA must weigh under 38 C.F.R. § 3.159(a)(2).

Common claim errors

Missing the instability rating

If the C&P examiner didn't test or didn't document instability, and you report your knee gives way, that's a development failure. The decision should not be based on a silent record on instability — it should be based on a complete one. A supplemental claim or HLR can reopen this.

Only one knee rated

If both knees are symptomatic, both get rated. Bilateral knee ratings also get a 10% bilateral factor bump under 38 C.F.R. § 4.26.

Meniscal tear (DC 5258) overlooked

A documented torn meniscus with locking and effusion is a flat 20% under DC 5258 — that can stack with limitation of motion separately.

Knee replacements

Total knee arthroplasty triggers the 100% rating for 13 months under DC 5055, then drops to a minimum 30% based on residual symptoms. Residual instability or limitation of motion after the minimum period continues to be rated on the underlying codes — the 30% is a floor, not a ceiling.