the 1987 AO Foundation system. In 2007, they extended their system, unifying the two systems regarding wrist, hand, foot, and ankle fractures. Classifications named after people A number of classifications are named after the person (eponymous) who developed it. "Denis classification" for spinal fractures "Frykman classification" for forearm fractures (fractures of radius and ulna) "Gustilo open fracture classification" "Letournel and Judet Classification" for Acetabular fractures "Neer classification" for humerus fractures Seinsheimer classification, Evans-Jensen classification, Pipkin classification, and Garden classification for hip fractures Prevention Both high- and low-force trauma can cause bone fracture injuries. Preventive efforts to reduce motor vehicle crashes, the most common cause of high-force trauma, include reducing distractions while driving. Common distractions are driving under the influence and texting or calling while driving, both of which lead to an approximate 6-fold increase in crashes. Wearing a seatbelt can also reduce the likelihood of injury in a collision. 30 km/h or 20 mph speed limits (as opposed to the more common intracity 50 km/h / 30 mph) also drastically reduce the risk of accident, serious injury and even death in crashes between motor vehicles and humans. Vision Zero aims to reduce traffic deaths to zero through better traffic design and other measures and to drastically reduce traffic injuries which would prevent many bone fractures. A common cause of low-force trauma is an at-home fall. When considering preventative efforts, the National Institute of Health (NIH) examines ways to reduce the likelihood of falling, the force of the fall, and bone fragility. To prevent at-home falls they suggest keeping cords out of high-traffic areas where someone could trip, installing handrails and keeping stairways well-lit, and installing an assistive bar near the bathtub in the washroom for support. To reduce the impact of a fall the NIH recommends to try falling straight down on your buttocks or onto your hands. Some sports have a relatively high risk of bone fractures as a common sports injury. Preventive measures depend to some extent on the specific sport, but learning proper technique, wearing protective gear and having a realistic estimation of one's own capabilities and limitations can all help reduce the risk of bone fracture. In contact sports rules have been put in place to protect athlete health, such as the prohibition of unnecessary roughness in American football. Taking calcium and vitamin D supplements can help strengthen your bones. Vitamin D supplements combined with additional