The Motorcyclist’s Thumb

a) What injury do you suspect?

b) What clinical test would you carry out to confirm your diagnosis? (See image below)

c) Describe how you would carry out this test and what would constitute a positive test result.

Your clinical examination is inconclusive, being limited by pain. Apart from arranging orthopaedic follow-up, suggest 2 investigations to confirm the diagnosis?

a) A Stener lesion is a recognised complication of this injury. Explain the anatomical basis of the Stener lesion.

b) Apart from the presence of a Stener lesion, list one other indication for early surgical intervention for this injury?