Document Detail


The influence of muscle load on tibiofemoral knee kinematics.
MedLine Citation:
PMID:  19890990     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A comparative kinematics study was conducted on six cadaver limbs, comparing tibiofemoral kinematics in five conditions: unloaded, under a constant 130 N ankle load with a variable quadriceps load, with and without a simultaneous constant 50 N medial and lateral hamstrings load. Kinematics were described as translation of the projected centers of the medial (MFT) and lateral femoral condyles (LFT) in the horizontal plane of the tibia, and tibial axial rotation (TR) as a function of flexion angle. In passive conditions, the tibia rotated internally with increasing flexion to an average of -16 degrees (range: -12/-20 degrees , SD = 3.0 degrees ). Between 0 and 40 degrees flexion, the medial condyle translated forwards 4 mm (range: 0.8/5.5 mm, SD = 2.5 mm), followed by a gradual posterior translation, totaling -9 mm (range: -5.8/-18.5 mm, SD = 4.9 mm) between 40-140 degrees flexion. The lateral femoral condyle translated posteriorly with increasing flexion completing -25 mm (range: -22.6 to -28.2 mm, SD = 2.5 mm). Dynamic, loaded measurements simulating a deep knee bend were carried out in a knee rig. Under a fixed ankle load of 130 N and variable quadriceps loading, tibial rotation was inverted, mean TR = 4.7 degrees (range: -3.3 degrees /11.8 degrees SD = 5.4 degrees ), MFT = -0.5 mm (range: = -4.3/2.4 mm, SD = 2.4 mm), LFT = 3.3 mm (range: = -3.6/10.6 mm, SD = 5.1 mm). Compared to the passive condition, all these excursions were significantly different (p < or = 0.015). Adding medial and lateral hamstrings force of 50 N each reduced TR, MFT, and LFT significantly compared to the passive condition. In general, loading the knee with hamstrings and quadriceps reduces rotation and translation compared to the passive condition. Lateral hamstring action is more influential on knee kinematics than medial hamstrings action.
Authors:
Jan Victor; Luc Labey; Pius Wong; Bernardo Innocenti; Johan Bellemans
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of orthopaedic research : official publication of the Orthopaedic Research Society     Volume:  28     ISSN:  1554-527X     ISO Abbreviation:  J. Orthop. Res.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-02-22     Completed Date:  2010-03-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404726     Medline TA:  J Orthop Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  419-28     Citation Subset:  IM    
Affiliation:
Department of Orthopaedics, AZ St-Lucas, St-Lucaslaan 29, 8310 Brugge, Belgium. j.victor@skynet.be
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MeSH Terms
Descriptor/Qualifier:
Aged
Aged, 80 and over
Biomechanics
Cadaver
Female
Femur / physiology*
Humans
Knee Joint / physiology*
Male
Muscle, Skeletal / physiology*
Range of Motion, Articular / physiology*
Rotation
Tibia / physiology*
Weight-Bearing

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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