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In page Congenital trigger thumb:
"Besides the clicking, snapping or triggering, a characteristic Notta nodule is commonly found on the palmar side at the metacarpophalangeal (MCP) joint.[1] This nodule can be found by palpation. Children can also present a thumb which they cannot extend actively due to entrapment of the nodule to the A1 pulley. Some may even present with a fixed flexion deformity of the IPJ where no extension is possible.[citation needed]
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