Diagnostic Code 5225 · 38 CFR §4.71a
Ankylosis of the index finger means complete loss of motion in the index finger joints. The index finger is critical for pointing, precision grip, typing, and many fine motor tasks. Its loss of motion particularly affects activities requiring pinch grip between the thumb and index finger.
| Rating | Criteria |
|---|---|
| 10% | 10% — Favorable ankylosis: index finger fixed in a functional position |
| 20% | 20% — Unfavorable ankylosis: index finger fixed in a non-functional position |
Medical records documenting complete loss of motion (ankylosis) in the affected finger joints. X-rays or imaging showing joint fusion or fixation. Range of motion testing showing zero degrees of motion. Documentation of whether ankylosis is in favorable or unfavorable position. Service treatment records or nexus opinion linking the condition to military service.