Which nerve injury involves temporary loss without disruption of axons and is typically the mildest form?

Which nerve injury involves temporary loss without disruption of axons and is typically the mildest form?

• A. Axonotmesis
• B. Neurotmesis
• C. Paresthesia
• D. Neuropraxia

Answer: (D)

Nerve injuries are categorized by how much the nerve fibers and supporting structures are affected. In the mildest form, there is a temporary loss of function caused by a conduction block from demyelination, while the axon remains intact. This is neuropraxia. Because the axon isn’t damaged, there’s no Wallerian degeneration and recovery happens relatively quickly as the myelin is repaired, often over days to weeks. In sports injuries, this often presents after a compressive or stretch event where strength and sensation return once conduction is restored. The other forms involve actual axonal injury or complete disruption: axonotmesis has axonal damage with preserved connective tissue, leading to distal degeneration and a slower, longer recovery that may be partial; neurotmesis is a complete nerve disruption with a poor prognosis without surgical repair. Paresthesia is an abnormal sensation that can accompany nerve injuries but is not itself a separate injury type.

Nerve injuries are categorized by how much the nerve fibers and supporting structures are affected. In the mildest form, there is a temporary loss of function caused by a conduction block from demyelination, while the axon remains intact. This is neuropraxia. Because the axon isn’t damaged, there’s no Wallerian degeneration and recovery happens relatively quickly as the myelin is repaired, often over days to weeks. In sports injuries, this often presents after a compressive or stretch event where strength and sensation return once conduction is restored. The other forms involve actual axonal injury or complete disruption: axonotmesis has axonal damage with preserved connective tissue, leading to distal degeneration and a slower, longer recovery that may be partial; neurotmesis is a complete nerve disruption with a poor prognosis without surgical repair. Paresthesia is an abnormal sensation that can accompany nerve injuries but is not itself a separate injury type.