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First the good news: protector backpacks can cushion the impact of a fall down to two per cent of the original energy. Now the bad news: back protectors - with or without a rucksack - are virtually ineffective against really serious back injuries.
Accident surgeons agree: the greatest dangers for mountain bikers lurk in rollovers. This happens at lightning speed and often leads to overextension of the cervical spine. The possible consequence: fracture and paraplegia. Also dangerous: compression, as occurs during drop landings. The vertebral bodies are pressed together and can collapse. There is no protection against either fall scenario. "The conclusion that back protectors are useless is nevertheless wrong," says Prof. Dr Christoph Siepe from the Spine Centre at the Schön-Klinik in Munich, "they can significantly mitigate direct impact trauma." This is the case, for example, if the biker is catapulted over the handlebars (see photo at the top) and hits their back on rocks.
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