Muscle Group VIII VA Disability Rating
Diagnostic Code 5308 · 38 CFR §4.73
What Is It?
Muscle Group VIII includes the extensor muscles of the wrist, fingers, and thumb located on the outer side of the forearm. These muscles straighten the wrist and fingers and allow you to extend your hand and open your grip. They work in coordination with the flexor muscles to control all hand and wrist movements. When these muscles are damaged, you have difficulty opening your hand, releasing objects, and stabilizing the wrist during gripping activities.
Rating Criteria
| Rating | Criteria |
|---|---|
| 30% | Severe injury to the dominant arm. Non-dominant severe is rated 20 percent. |
| 20% | Moderately severe injury to the dominant or non-dominant arm. |
| 10% | Moderate injury with reduced wrist extension or finger straightening ability. |
| 0% | Slight injury with minimal functional impact. |
Evidence Needed
- Service records documenting the outer forearm muscle injury
- Treatment records for the muscle or tendon repair
- Wrist extension and finger extension strength testing
- Documentation of any wrist drop or finger extension lag
- Statements about functional limitations with hand opening and wrist stability
C&P Exam Tips
- Have the examiner test your ability to extend the wrist and straighten all fingers against resistance
- Describe difficulty releasing grip on objects
- Report any wrist drop where the wrist falls limp when you try to hold it straight
- Show visible muscle loss on the top of the forearm if present
- Mention problems with typing, using tools, or other tasks requiring wrist stability
How to File
File under DC 5308 with evidence of the extensor muscle injury and functional testing showing the loss of wrist and finger extension strength.
Common Mistakes
Confusing extensor muscle weakness with radial nerve palsy — if nerve damage is present, it should be separately rated Not testing extension specifically when the examiner focuses on grip strength alone Failing to document wrist drop which is a severe manifestation of extensor weakness Not specifying dominant arm
Frequently Asked Questions
What is wrist drop?
Wrist drop occurs when the extensor muscles are so weak that the wrist cannot be held in a neutral position and falls limp. This can result from severe muscle damage or from radial nerve injury. It significantly impairs all hand function because you cannot stabilize the wrist for gripping.
How is this different from a radial nerve injury?
Muscle Group VIII injury involves direct damage to the muscles themselves. Radial nerve injury damages the nerve that controls these muscles. Both can cause similar symptoms, but they are rated under different codes. If both the muscle and nerve are damaged, both can potentially be claimed.