Oslo Sports Trauma Research Center

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Information about project titled 'Kinematics for an ACL injury in World Cup alpine skiing'

Kinematics for an ACL injury in World Cup alpine skiing

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Project status: Published
Project manager: Tone Bere
Supervisor(s): Lars Nordsletten, Roald Bahr
Coworker(s): Hideyuki Koga, Tron Krosshaug, Kam Ming Mok


We have limited insight into the mechanisms of anterior cruciate ligament (ACL) injuries in alpine skiing, particularly among professional ski racers.

The objective is to describe the detailed joint kinematics of an ACL injury in World Cup alpine skiing using a model-based image-matching (MBIM) technique.



Video of an ACL injury situation in slalom, captured with two nearly perpendicular camera views, was analyzed using the MBIM method to obtain the time sequence of knee and hip joint kinematics. This method is a specific technique for three-dimensional reconstruction of human motion from video sequences developed and validated at the Oslo Sport Trauma Research Center.

The technique involves a manual matching of a skeleton model to the background video pictures. The skeleton computer model was constructed based on anthropometrical measures to the skier and consisted of 24 different segments, including skis and poles.


Results from this project will provide a better understanding on why and how the ACL injuries occur.