Bicycle Handlebars as a Risk of Injury

Graz University of Technology and the “Große schützen Kleine” association have investigated abdominal injuries in children following bicycle accidents as part of a Master’s thesis. Result? The design of the handlebars makes a big difference.

In Austria, around 8,000 children and young people are injured in cycling accidents every year and subsequently treated in hospital. Around 600 of the injuries are directly attributable to contact with the handlebars, and around 19 per cent of these require hospitalisation. It is striking that around half of the injuries caused by the handlebars affect the abdomen. Specifically, they are injuries (e.g. bruises, tears) to the liver, pancreas or spleen, explains Christoph Arneitz, senior physician at the Department of Paediatric and Adolescent Surgery in Klagenfurt, who medically analyses such accidents.

Abdominal injuries typically occur when a child falls onto the end of the handlebars of a bicycle lying on its side on the ground, or in rear-end collisions when the handlebars suddenly turn after a collision.

Properly moulded handlebar ends go a long way towards preventing injuries. (c) woom GmbH

Simulations with six handlebar ends

Maximilian Schinagl investigated these accident situations for his Master’s thesis at the Institute of Vehicle Safety at Graz University of Technology (TU Graz). Using a virtual human body model of a child, he simulated the consequences of a blunt impact to the abdomen from various angles. For his simulations, six handlebar ends from different manufacturers and a defective handlebar end (without protective cap) were used as a base value.

As Schinagl shows on the basis of the simulation-based study, the design of the handlebar ends has a significant influence on whether children are injured in bicycle accidents and how serious these injuries are. Injury criteria such as contact force, penetration depth, loads on the abdominal wall and organs were analysed. Handlebar ends with widened protective caps showed the best protective effect.

Still plenty of research potential

A follow-up project is currently underway at TU Graz in cooperation with the Austrian children’s bicycle manufacturer woom, in which the influence of the handlebar ends on abdominal injuries is being analysed in detail. “In the course of our simulations, we have seen that handlebar ends with a larger diameter can reduce the risk of injury by up to 20 per cent,” explains Nico Erlinger from the Institute of Vehicle Safety at TU Graz, who is involved in the project. “As there have only been a few studies on injuries in this type of accident so far, there is still a lot of potential to reduce the risk with further research.”

Although woom already uses handlebar ends with widened protective caps that significantly reduce the risk of injury, this project aims to increase the safety of handlebar ends even further. A publication resulting from the project was presented last September at the conference of the International Research Council on the Biomechanics of Injury (IRCOBI) in Cambridge, UK (https://www.ircobi.org/wordpress/downloads/irc23/pdf-files/2324.pdf). “Cycling safety is our top priority,” says woom CEO Paul Fattinger: “By working together with research institutions, we can optimise the design of bicycle components on the basis of empirical evidence.”

Wissenschaftliche Ansprechpartner:

Nico Erlinger
Dipl.-Ing. BSc
TU Graz | Institute of Vehicle Safety
Tel: +43 316 873 30359
nico.erlinger@tugraz.at

Originalpublikation:

Simulation of Blunt Abdominal Impacts caused by Handlebar Ends during Bicycle Crashes with the
PIPER Child Model https://www.ircobi.org/wordpress/downloads/irc23/pdf-files/2324.pdf

http://www.tugraz.at