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Dynamic knee stability as estimated by finite helical axis methods during drop landing twenty years after anterior cruciate ligament injury
Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.
Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.
Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.ORCID iD: 0000-0002-0366-4609
2015 (English)In: Journal of Biomechanics, ISSN 0021-9290, E-ISSN 1873-2380, Vol. 48, no 10, 1906-1914 p.Article in journal (Refereed) Published
Abstract [en]

Finite helical axis (FHA) measures of the knee joint during weight-bearing tasks may capture dynamic knee stability following Anterior Cruciate Ligament (ACL) injury. The aim was to investigate dynamic knee stability during two-leg squat (TLS) and one-leg side hop (SH) in a long-term follow-up of ACL injury, and to examine correlations with knee laxity (KT-1000), osteoarthritis (OA, Kellgren–Lawrence) and knee function (Lysholm score). Participants were injured 17–28 years ago and then treated with surgery (n=33, ACLR) or physiotherapy only (n=37, ACLPT) and healthy-knee controls (n=33) were tested. Movements were registered with an optical motion capture system. We computed three FHA inclination angles, its' Anterior–Posterior (A–P) position, and an index quantifying directional changes (DI), during stepwise knee flexion intervals of ∼15°. Injured knees were less stable compared to healthy controls' and to contralateral non-injured knees, regardless of treatment: the A–P intersection was more anterior (indicating a more anterior positioning of tibia relative to femur) positively correlating with high laxity/low knee function, and during SH, the FHA was more inclined relative to the flexion–extension axis, possibly due to reduced rotational stability. During the TLS, A–P intersection was more anterior in the non-injured knee than the injured, and DI was higher, probably related to higher load on the non-injured knee. ACLR had less anterior A–P intersection than ACLPT, suggesting that surgery enhanced stability, although rotational stability may remain reduced. More anterior A–P intersection and greater inclination between the FHA and the knee flexion–extension axis best revealed reduced dynamic stability ∼23 years post-injury.

Place, publisher, year, edition, pages
2015. Vol. 48, no 10, 1906-1914 p.
Keyword [en]
Finite helical axis, Anterior cruciate ligament injury, Dynamic knee stability, Long-term follow up, Motion analysis
National Category
Physiotherapy
Identifiers
URN: urn:nbn:se:umu:diva-110339DOI: 10.1016/j.jbiomech.2015.04.016ISI: 000358459800031OAI: oai:DiVA.org:umu-110339DiVA: diva2:874181
Conference
1st Clinical Movement Analysis World Conference, 23rd Annual Meeting of the European Society of Movement analysis in Adults and Children (ESMAC), Rom Sept 29 - Oct 4
Available from: 2015-11-26 Created: 2015-10-21 Last updated: 2015-12-22Bibliographically approved

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Grip, HelenaTengman, EvaHäger, Charlotte
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