Group VIII. Function: Extension of wrist, fingers, and thumb; abduction of thumb. Muscles arising mainly from external condyle of humerus: Extensors of carpus, fingers, and thumb; supinator (DC 5308)

Rating levels

• 30% — You have severe damage to the muscles on the outside of your forearm that control straightening your wrist and fingers, lifting your thumb away from your hand, and turning your palm upward. This means you have major difficulty or cannot perform these movements properly, significantly limiting your ability to grip objects, write, type, or perform other hand activities that require extending your fingers or moving your thumb normally.
• 20% — This rating applies when you have severe damage to the muscles on the outer side of your forearm that control straightening your wrist and fingers, lifting your thumb away from your hand, and rotating your palm upward. You would have significant difficulty or inability to extend your wrist back, straighten your fingers, move your thumb away from your palm, or turn your hand from palm-down to palm-up position. These muscle problems would seriously limit your ability to grip objects, write, type, or perform most hand activities that require opening your hand or rotating your wrist.
• 20% — You have moderately severe damage to the muscles on the outside of your forearm that control straightening your wrist and fingers, extending your thumb, and rotating your palm upward. This means you have significant difficulty or weakness when trying to lift your hand up at the wrist, straighten your fingers, stick your thumb out to the side, or turn your palm from face-down to face-up position, but you still have some ability to do these movements.
• 20% — You have moderately severe damage to the muscles on the outside of your forearm that control straightening your wrist and fingers, extending your thumb, and rotating your palm upward. This means you have significant difficulty or weakness when trying to lift your hand up at the wrist, straighten your fingers, stick your thumb out to the side, or turn your palm from face-down to face-up position, but you still have some ability to do these movements.
• 10% — You have moderate problems with straightening your wrist, fingers, and thumb, along with moving your thumb away from your palm. The muscles on the outer side of your elbow that control these movements (the ones that let you extend and spread your fingers, bend your wrist back, and rotate your forearm) are working but with noticeable difficulty or weakness that interferes with daily activities.
• 10% — You have moderate problems with straightening your wrist, fingers, and thumb, along with moving your thumb away from your palm. The muscles on the outer side of your elbow that control these movements (the ones that let you extend and spread your fingers, bend your wrist back, and rotate your forearm) are working but with noticeable difficulty or weakness that interferes with daily activities.
• 0% — A "slight" rating applies when you have minor problems with extending your wrist, straightening your fingers, or moving your thumb away from your hand due to muscle injury on the outer part of your forearm. These symptoms cause minimal interference with your daily activities and don't significantly limit your ability to use your hand for normal tasks like gripping, writing, or lifting objects.
• 0% — A "slight" rating applies when you have minor problems with extending your wrist, straightening your fingers, or moving your thumb away from your hand due to muscle injury on the outer part of your forearm. These symptoms cause minimal interference with your daily activities and don't significantly limit your ability to use your hand for normal tasks like gripping, writing, or lifting objects.