Hand eteaching Nerve Injury Quiz 27012023

You are called to see an 18 year old gentleman in the ER after he has been stabbed in posterior aspect of the arm. He has an obvious wrist drop. Suspecting an injury to the radial nerve, you decide to take the patient to the operating room where you find a transected radial nerve that is primarily repaired without tension. In discussing the prognosis for recovery with him, the factor that is most closely linked to his recovery is:

• Mechanism of injury flaps, tissue expansion, free flap

• Time to repair

• His age

• Level of injury

• Condition of the wound

Which statement most accurately describes the physiology of peripheral nerve regeneration following an axonometsis lesion?

• The proximal nerve section undergoes antegrade Wallerian degeneration

• Axon growth occurs from the distal segment to proximal segment

• Neurotrophic factors direct the phagocytic activity

• Proximal axon budding allow to antegrade axon migration

• Axoplasm and myelin are degraded distally predominantly by schwann cells for the first 12 months of injury

Which of the following peripheral nerve structures function to cushion the nerve against external pressure?

• Endoneurium

• Internal Epineurium

• Perineurium

• External Epineurium

A patient sustained laceration wound over left forearm with open fracture of distal radius for more than 24 hours. However the wound appeared to be clean. Intraoperatively, noted there is ulnar nerve cut with loss of nerve around 2 cm. What would be your next step as surgeon?

• Epineural neuroraphy

• Perineural neurophy

• Primary ulnar nerve using sural nerve as a graft

• Proceed later for secondary repair

• Delayed Grafting of ulnar nerve using autograft

During neurotization of Motor branch of biceps brachii using Oberlin 1 procedure, which site of coaptation of nerve deliver the best result?

• Donor: Proximal, Recipient: Distal

• Donor: Distal, Recipient: proximal

• Surgeon preference

• Based on which site (Donor/ Recipient) has longer length

• Coaptation of donor and recipient nerves should be at the same length