Abstract:
BACKGROUND:Methods for analyzing the mechanisms of injuries in sports from video sequences of injury situations are so far limited to a simple visual inspection, which has shown poor accuracy. PURPOSE:To investigate whether a new model-based image-matching technique could successfully be applied to estimate kinematic characteristics of three typical anterior cruciate ligament (ACL) injury situations. METHODS:A four-camera basketballvideo, a three-camera European team handball video and a single-camera downhill skiing video were imported into the program Poser 4, where a skeleton model and a model of the surroundings were matched to the background image frame by frame. When the match was considered satisfactory, joint angles as well as velocity and acceleration of the center of mass were calculated using Matlab. RESULTS:In the basketball and handball matchings, the skeleton and surrounding models were successfully matched to the background through all frames in all camera angles. Detailed time courses for joint kinematics and ground reaction force were obtained, while less information could be acquired from the single-view skiing accident. CONCLUSION:The model-based image matching technique can be used to extract kinematic characteristics from videotapes of actual ACL injuries, and may provide valuable information on the mechanisms for ACL injuries in sports.
journal_name
Scand J Med Sci Sportsjournal_title
Scandinavian journal of medicine & science in sportsauthors
Krosshaug T,Slauterbeck JR,Engebretsen L,Bahr Rdoi
10.1111/j.1600-0838.2006.00558.xsubject
Has Abstractpub_date
2007-10-01 00:00:00pages
508-19issue
5eissn
0905-7188issn
1600-0838pii
SMS558journal_volume
17pub_type
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journal_title:Scandinavian journal of medicine & science in sports
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