Linear focal elastosis localized to bilateral knee of a marathon runner.

The article describes the case of a 16-year-old marathon-runner girl who developed linear focal elastosis (LFE) localized to bilateral knee. Topics covered include the characteristics of LFE, which include linear, symmetric, palpable papules, and cords in a layered fashion on the mid-upper and lower back, and the link between LFE and strenuous mechanical activities such as exercise.