OVER AN eight-year span, 138 of 1,584 cyclists who started the Tour de France had to withdraw because of injuries — almost half from crashes that fractured their clavicle (the most common injury), wrist, hand, femur, humerus (not funny) or ribs. Sounds pretty perilous, but it’s nothing compared with the statistics in a recent Lancet article covering research from the National Highway Traffic Safety Administration.

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It reveals the escalating risks associated with biking, especially in congested urban centers where bike-sharing programs speed commuters to work and students to school. There were 36.5 million trips on bike-share systems last year. Consider this:

Mehmet Oz, M.D., is host of “The Dr. Oz Show,” and Mike Roizen, M.D., is chief wellness officer and chairman of Wellness Institute at Cleveland Clinic. To live your healthiest, tune into “The Dr. Oz Show” or visit www.sharecare.com.