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Highlights The lateral band snapping syndrome (LBSS) in the proximal interphalangeal joint (PIPJ) is the subluxation of lateral band of the extensor tendon resulting from injury of the retinacular ligament, causing finger snapping during flexion of the PIPJ. Ultrasonography can visualize the subluxation of lateral band, facilitating diagnosis of LBSS in the PIPJ. Patients with LBSS may benefit from prompt repair of the retinacular ligament without sequela.

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