Spontaneous extensor tendon rupture of fingers is a relatively rare clinical injury. Factors such as repeated wear, inflammatory infiltration, and compression ischemia can all lead to tendon degeneration, increased tendon fragility, and sudden external force can cause spontaneous tendon rupture. Due to insufficient attention, most patients present with old injuries, severe retraction of tendon ends, increased adhesion, increased fragility, and weakened strength of tendons. Tendon transplantation and transposition are commonly used in clinical treatment. This study retrospectively analyzed a clinical case of spontaneous rupture of the extensor hallucis longus tendon caused by abnormal osteophyte on the dorsal side of the radius, and explored the diagnosis, treatment, and prognosis of this disease, in order to enhance clinicians' understanding of this disease and provide reference for its clinical diagnosis and treatment.

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