Any loss in grip strength on that side?
Several things can happen when a peripheral nerve is damaged, depending on the extent. Can result in repairable damage with recovery complete enough that anything permanent is unnoticeable.... so these are cases where the nerve sheath is intact and axons can recover better within that scaffold. Certain surgeries can achieve this in wholly severed nerves if performed quickly and skillfully enough.
In cases with long term nerve damage and extensive cell death, recovery of activation for some motor units may not be possible... that link is dead for life.
Both of these can result in muscle atrophy, but recovery can only happen in one of them. Even with loss of motor units, you can get some neurogenesis with remaining motor units expanding their turf a little bit and making up for it in other ways. So you can end up with muscle that has mass but isn't quite as efficient. I get patients with mild spinal cord injuries where their quad is actually fairly decent size, compared to the other side, but you get them on their feet and their knee buckles from weakness.
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