Muscle Group XI VA Disability Rating
Diagnostic Code 5311 · 38 CFR §4.73
What Is It?
Muscle Group XI consists of the posterior and lateral muscles of the lower leg, primarily the gastrocnemius and soleus muscles that form the calf, along with the peroneal muscles on the outer side of the leg. These muscles control ankle plantar flexion (pointing the foot down), push-off during walking, and stabilization of the foot and ankle. The calf muscles are among the most important for walking, running, and climbing stairs. Military injuries from shrapnel, gunshot wounds, and blast events frequently damage these muscles.
Rating Criteria
| Rating | Criteria |
|---|---|
| 30% | Severe injury with major loss of push-off power and ankle stabilization. |
| 20% | Moderately severe injury with significant loss of calf function. |
| 10% | Moderate injury with some loss of push-off strength or ankle stability. |
| 0% | Slight injury with minimal functional impact. |
Evidence Needed
- Service records documenting the lower leg muscle injury
- Treatment records including debridement, surgery, or prolonged care
- Calf strength testing and ankle function assessment
- Measurement of calf circumference comparing both legs
- Statements about difficulty with walking, stairs, and standing on toes
C&P Exam Tips
- Have the examiner measure calf circumference on both sides to document muscle loss
- Try to stand on your toes on the affected side to demonstrate push-off weakness
- Describe difficulty climbing stairs and walking uphill
- Report how far you can walk before calf fatigue or pain stops you
- Show any scarring or visible muscle loss in the calf area
How to File
File under DC 5311 with evidence of the lower leg muscle injury and functional testing of calf and ankle function. Calf circumference measurements provide objective evidence of muscle atrophy.
Common Mistakes
Not getting calf circumference measurements which objectively demonstrate muscle loss Failing to test push-off strength which is the primary function of these muscles Not documenting how the muscle loss affects walking endurance Missing secondary claims for ankle instability caused by weakened stabilization muscles
Frequently Asked Questions
Why is calf circumference important for this claim?
Calf circumference is an objective measurement that shows muscle wasting. If the injured calf is noticeably smaller than the uninjured side, it provides clear evidence of muscle tissue loss that supports a higher severity classification.
Can a calf muscle tear from running qualify?
Yes, if the tear occurred during military service and resulted in permanent muscle impairment. Acute tears that healed completely without lasting weakness would not qualify, but if you have chronic weakness, reduced calf bulk, or recurring problems, you may have a valid claim.