Medical-journals mystery? What about those parking-gate injuries?

Why are there so very few medical journal reports about parking-gate injuries?

Such injuries — which happen when a parking lot gate encounters a human body — are reported to be frequent and expensive. Yet PubMed, the preeminent database of medical studies and other medical reports, seems to include almost no medical reports about this kind of injury. Why? Have we been negligent in our search attempts? Are these kinds of injuries considered so very straightforward to treat that no medical professionals deem them worth writing about?

This video claims to show one of presumably many incidents:

As to the prevalence of this kind of injury, the trade news source Parking Today reported, in 2011: “Gate-arm accidents are responsible for 5% of all reported personal injury claims occurring in parking garages, says a study conducted by the International Parking Institute. They also present the third-highest average dollar amount, at $2,800 per claim.”

The mystery of why there are so few medical journal reports extends, too, to the question of injuries incurred when an automobile driver has physically unhappy intercourse with a parking lot automatic-ticket-payment-collection machine.