Proximal interphalangeal joint stress fractures commonly occur as epiphyseal line injuries in teenage climbers; however, fractures with closed epiphyseal lines are rare. Poor outcomes are more common if treatment is delayed. We report the case of a 16-year-old climber who underwent delayed surgical treatment for a fracture with a closed epiphyseal line, with a favorable outcome. There was 20 ° extension lag at the proximal interphalangeal joint and a fracture on the dorsal aspect of the base of the metaphyseal bone, with osteosclerosis at the fracture site. The fracture site was refreshed and internal fixation was performed using the tension-band wiring technique. At 3 months postoperatively, there was no pain, extension had improved, and bone union was achieved. This case illustrates the effectiveness of surgery in achieving favorable outcomes for delayed proximal interphalangeal joint stress fractures in climbers with epiphyseal line closure.

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