Oslo Sports Trauma Research Center

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Information about project titled 'Video analysis of an ACL injury situation in world cup alpine skiing using model-based image-matching technique'

Video analysis of an ACL injury situation in world cup alpine skiing using model-based image-matching technique

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


FIS Injury Surveillance System (FIS ISS), established at the Oslo Sports Trauma Research Center (OSTRC), has shown that one of three athletes in World Cup alpine skiing sustain an injury per season. Approximately 30% of all injuries are serious injuries leading to long term absence from training and competition. Knee injuries, particular tears of the anterior cruciate ligament (ACL) represent a major problem. A precise description of the injury mechanism is critical to be able to reduce the risk of ACL injuries.

Video analysis of injury tapes is the only method available to extract biomechanical information on the mechanism. However, video analysis has been limited to simple visual inspection, which has been shown to be inaccurate, even among experienced researchers.

Alternatively, a model-based image-matching (MBIM) technique has been developed to extract joint kinematics from video recordings using one or more uncalibrated cameras. MBIM technique has been validated in non-injury situations in a laboratory environment and also has been found to be feasible for use in actual ACL injury situations.


The aim of this project is to describe in detail mechanisms of ACL injury in World Cup alpine skiing using MBIM technique.



From videotapes of ACL tears reported through the FIS ISS that were recorded from three seasons (2006-09), videotapes that were recorded from two or more cameras will be picked up and will be analyzed using MBIM technique. It will provide an estimate of the time course of joint kinematics and ground reaction forces for the injury sequence.

This project will provide a better understanding of ACL injury mechanisms in World Cup alpine skiing.