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Tibiofemoral joint forces during isokinetic knee extension.
KTH, School of Technology and Health (STH), Ergonomics. (Ergonomi)
1989 (English)In: American Journal of Sports Medicine, ISSN 0363-5465, E-ISSN 1552-3365, Vol. 17, no 1, 49-54 p.Article in journal (Refereed) Published
Abstract [en]

Using a Cybex II, eight healthy male subjects performed isokinetic knee extensions at two different speeds (30 and 180 deg/sec) and two different positions of the resistance pad (proximal and distal). A sagittal plane, biomechanical model was used for calculating the magnitude of the tibiofemoral joint compressive and shear forces. The magnitude of isokinetic knee extending moments was found to be significantly lower with the resistance pad placed proximally on the leg instead of distally. The tibiofemoral compressive force was of the same magnitude as the patellar tendon force, with a maximum of 6300 N or close to 9 times body weight (BW). The tibiofemoral shear force changed direction from being negative (tibia tends to move posteriorly in relation to femur) to a positive magnitude of about 700 N or close to 1 BW, indicating that high forces arise in the ACL when the knee is extended more than 60 degrees. The anteriorly directed shear force was lowered considerably by locating the resistance pad to a proximal position on the leg. This model may be used when it is desirable to control stress on the ACL, e.g., in the rehabilitative period after ACL repairs or reconstructions.

Place, publisher, year, edition, pages
1989. Vol. 17, no 1, 49-54 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:kth:diva-77578PubMedID: 2929836OAI: diva2:491981
NR 20140805Available from: 2012-02-07 Created: 2012-02-07 Last updated: 2012-02-12Bibliographically approved

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