Document Detail


Study of the control strategy of the quadriceps muscles in anterior knee pain.
MedLine Citation:
PMID:  11001513     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Anterior knee pain (AKP) is a common pathological condition, particularly among young people and athletes, associated to an abnormal motion of the patella during the bending of the knee and possibly dependent on a muscular or structural imbalance. A lack of synergy in the quadriceps muscles results in a dynamic misalignment of the patella, which in turn produces pain. AKP rehabilitative therapy consists of conservative treatment whose main objective is to strengthen the Vastus Medialis. The aim of this article is to study the quadriceps muscle control strategy in AKP patients during an isokinetic exercise. Analysis of the muscle activation strategy is important for an objective measurement of the knee functionality in that it helps to diagnose and monitor the rehabilitative treatment. Surface electromyography (EMG) from the three superficial muscles of the femoral quadriceps during a concentric isokinetic exercise has been analyzed along with the signals of knee joint position and torque. A group of 12 AKP patients has been compared with a group of 30 normal subjects. Analysis of the grand ensemble average of the EMG linear envelopes in AKP patients reveals significant modifications in Vastus Medialis activity compared to the other quadriceps muscles. In order to study the synergy of the muscles, temporal identifiers have been associated to the EMG linear envelopes. To this end, EMG linear envelope decomposition in Gaussian pulses turned out to be effective and the results highlight an appreciable delay in the activation of the Vastus Medialis in AKP patients. This muscular unbalance can explain the abnormal motion of the patella.
Authors:
M Cesarelli; P Bifulco; M Bracale
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  IEEE transactions on rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society     Volume:  8     ISSN:  1063-6528     ISO Abbreviation:  IEEE Trans Rehabil Eng     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2001-01-03     Completed Date:  2001-01-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9413994     Medline TA:  IEEE Trans Rehabil Eng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  330-41     Citation Subset:  IM    
Affiliation:
Department of Electronic Engineering and Telecommunication, University of Naples, Federico II, Italy. cesarell@unina.it
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Biomechanics
Case-Control Studies
Electromyography
Exercise Test
Humans
Isotonic Contraction / physiology*
Knee Joint / physiopathology*
Linear Models
Male
Muscle, Skeletal / physiopathology*
Normal Distribution
Pain / physiopathology*,  prevention & control*,  rehabilitation
Range of Motion, Articular / physiology*
Signal Processing, Computer-Assisted
Torque

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


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