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Injury of digital nerve of thumb — Clinical Guidelines

Overview

Injury to the digital nerve of the thumb can result from various traumatic events, leading to sensory and motor deficits depending on the severity and location of the nerve damage. 1

Diagnosis

Clinical examination focusing on sensory and motor function assessment.

Electromyography (EMG) and nerve conduction studies may be necessary for definitive diagnosis 1.

Imaging (e.g., MRI) to rule out concomitant soft tissue injuries or fractures 2.

Management

First-line treatments:

- Immediate splinting to stabilize the thumb and prevent further injury 2. - Surgical repair for traumatic nerve injuries, particularly when there is significant damage or loss of function 1.

Adjunctive treatments:

- Physical therapy focusing on sensory reeducation and motor recovery 1. - Pain management with NSAIDs for associated inflammation and discomfort 2.

Special Populations

Pediatrics: Specific considerations for growth and development; conservative management may be preferred initially 2.

Elderly: Increased risk of complications; careful monitoring and tailored rehabilitation programs are essential 2.

Key Recommendations

Utilize specialized flaps like bilobed racquet flaps for extensive thumb reconstruction following degloving injuries to optimize functional outcomes (Evidence: Weak) 1.

Employ modified thumb spica splints for stabilization in emergency settings to prevent further injury and promote healing (Evidence: Expert opinion) 2.

In skiing-related thumb injuries, advise skiers to maintain grip on ski poles until the last moment before impact to potentially reduce ulnar collateral ligament injuries (Evidence: Moderate) 5.

References

1 Couceiro J, De la Red-Gallego M, Yeste L, Ayala H, Sanchez-Crespo M, Velez O et al.. The Bilobed Racquet Flap or Extended Seagull Flap for Thumb Reconstruction: A Case Report. The journal of hand surgery Asian-Pacific volume 2018. link 2 Hart RG, Kleinert HE, Lyons K. A modified thumb spica splint for thumb injuries in the ED. The American journal of emergency medicine 2005. link 3 De Smet L, Van Ransbeeck H. Mallet thumb. Acta orthopaedica Belgica 2003. link 4 Madhok R. Mallet thumb: an unusual association. Orthopaedic review 1989. link 5 Engkvist O, Balkfors B, Lindsjö U. Thumb injuries in downhill skiing. International journal of sports medicine 1982. link

Injury of digital nerve of thumb