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a A 49-year-old male with a purely tendinous mallet finger and noticeable extensor lag. There is also noticeable hyperextension at the level of the PIPJ, resulting in a swan-neck deformity b A 16-year old male with a bony mallet finger involving a fleck of bone and minimal extensor lag as the finger is in a cylinder cast. The shadow of the cast can be appreciated on the radiograph
