Paralysis of the deep peroneal nerve, which may cause foot drop and numbness between the first and second toes.
For a 30% rating, medical records and examination findings would need to show complete loss of dorsal flexion of the foot on the affected side. A VA or private examination documenting that you cannot lift the front of your foot at all is central to this level.
For incomplete paralysis, the records and findings that matter most are those that show how much function remains. Examination findings describing the degree of weakness, reduced range of motion, or sensory loss help establish whether the picture is mild, moderate, or severe. Nerve conduction studies or electromyography results that show the extent of nerve damage can support higher levels of incomplete paralysis. If your symptoms are sensory only, the regulation limits the rating to mild or moderate at most.
Statements from you or people who know you describing how foot drop or weakness affects your walking, work duties, or daily activities can help show functional impact at each level.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.