[Differential Diagnoses of Trigger Thumb]

Area of Science:

• Pediatric Orthopedics
• Hand Surgery
• Developmental Pediatrics

Background:

• Trigger thumb is a frequent congenital hand anomaly in young children.
• Accurate diagnosis is crucial for effective management and preventing long-term complications.

Purpose of the Study:

• To outline the key clinical distinctions between trigger thumb and its common differential diagnoses in toddlers.
• To guide pediatric surgeons in accurate diagnosis for appropriate treatment selection.

Main Methods:

• Review of typical clinical presentations of trigger thumb and its mimics.
• Description of characteristic physical examination findings for each condition.

Main Results:

• Trigger thumb presents with characteristic nodule and catching.
• Thumb-in-palm deformity shows adduction and flexion contracture.
• Hyperflexible thumb exhibits excessive passive extension.
• Thumb hypoplasia involves underdeveloped thenar structures.
• Congenital IPJ stiffness shows limited distal joint motion.

Conclusions:

• Recognizing subtle clinical signs is essential for differentiating trigger thumb from other pediatric thumb conditions.
• Accurate differential diagnosis leads to tailored and effective surgical or non-surgical interventions.