NDLI: An in-vivo study of ACL strain in the normal knee during Lachman and Drawer tests

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An in-vivo study of ACL strain in the normal knee during Lachman and Drawer tests

Content Provider	IEEE Xplore Digital Library
Author	Erickson, A. Beynnon, B. Werthiemer, C. Fleming, B. Pope, M.H. Johnson, R. Howe, J. Nichols, C.
Copyright Year	1988
Description	Author affiliation: McClure Musculoskeletal Res. Center, Burlington, VT, USA (Erickson, A.; Beynnon, B.; Werthiemer, C.; Fleming, B.; Pope, M.H.; Johnson, R.; Howe, J.; Nichols, C.)
Abstract	To diagnose an anterior cruciate ligament (ACL) injury, clinicians perform a Lachman test at 30 degrees of flexion or a Drawer test at 90 degrees of flexion to record how far the tibia displaces anteriorly with respect to the femur. A study was undertaken to characterize the normal strain pattern of the ACL in vivo during the Lachman and Drawer tests, and to determine if there is a significant difference between the strain patterns at clinically applied load levels. Five patients were studied. After routine arthroscopic surgery a Hall-effect displacement transducer was attached arthroscopically to the ACL to measure strain. Loads were applied by a hand-held load cell in a transverse plane directed through the midtibial tuberosity at flexion angles of 90 degrees and 30 degrees . The difference in percentage strain between the Lachman and Drawer tests was highly significant at p<0.01 level. These results clearly show that the Lachman test produces a greater elongation or strain in the ACL in comparison to the Drawer test at loads to 35 lb. From these data the authors characterize the normal ACL strain pattern.<>
Starting Page	19
Ending Page	21
File Size	184090
Page Count	3
File Format	PDF
DOI	10.1109/NEBC.1988.19332
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-03-10
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitive sensors Knee Testing Strain measurement Ligaments Injuries Performance evaluation In vivo Surgery Transducers
Content Type	Text
Resource Type	Article

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