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Altered visual and feet proprioceptive feedbacks during quiet standing increase postural sway in patients with severe knee osteoarthritis.

Hirata RP, Jørgensen TS, Rosager S, Arendt-Nielsen L, Bliddal H, Henriksen M, Graven-Nielsen T - PLoS ONE (2013)

Bottom Line: Centre of pressure (Cop) standard deviation, speed, range and Cop mean position in both directions (anterior-posterior and medial-lateral) were extracted from the force platform data.The patients were divided into "less severe" (KL 1 and 2, n = 24) and "severe" (KL>2, n = 18) group.THE RESULTS SUPPORT THAT: (i) the postural reorganization under manipulation of the different sensory information is worse in obese KOA patients with severe degeneration and/or high pain intensity when compared with less impaired patients, and (ii) higher pain intensity is related to worse body balance in obese KOA patients.

View Article: PubMed Central - PubMed

Affiliation: Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark.

ABSTRACT

Objective: The objective was to investigate how postural control in knee osteoarthritis (KOA) patients, with different structural severities and pain levels, is reorganized under different sensory conditions.

Methods: Forty-two obese patients (BMI range from 30.1 to 48.7 kg*m(-2), age range from 50 to 74 years) with KOA were evaluated. One minute of quiet standing was assessed on a force platform during 4 different sensory conditions, applied 3 times at random: Eyes open (EO) and eyes closed (EC) standing on firm and soft (foam) surfaces (EO-soft and EC-soft). Centre of pressure (Cop) standard deviation, speed, range and Cop mean position in both directions (anterior-posterior and medial-lateral) were extracted from the force platform data. Structural disease severity was assessed from semiflexed standing radiographs and graded by the Kellgren and Lawrence (KL) score. Pain intensity immediately before the measurements was assessed by numeric rating scale (range: 0-10).

Results: The patients were divided into "less severe" (KL 1 and 2, n = 24) and "severe" (KL>2, n = 18) group. The CoP range in the medial-lateral direction was larger in the severe group when compared with the less severe group during EC-soft condition (P<0.01). Positive correlation between pain intensity and postural sway (range in medial-lateral direction) was found during EC condition, indicating that the higher the pain intensity, the less effective is the postural control applied to restore an equilibrium position while standing without visual information.

Conclusion: THE RESULTS SUPPORT THAT: (i) the postural reorganization under manipulation of the different sensory information is worse in obese KOA patients with severe degeneration and/or high pain intensity when compared with less impaired patients, and (ii) higher pain intensity is related to worse body balance in obese KOA patients.

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Related in: MedlinePlus

Representative examples of bidimensional center of pressure (CoP) trajectory for a representative subject from the “severe” (red line) and “less severe” (blue line) group during one minute of quiet standing with eyes closed on the soft (foam) surface.
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pone-0071253-g001: Representative examples of bidimensional center of pressure (CoP) trajectory for a representative subject from the “severe” (red line) and “less severe” (blue line) group during one minute of quiet standing with eyes closed on the soft (foam) surface.

Mentions: Examples of CoP excursion for representative “severe” and “less severe” patients are illustrated in Figure 1. The data for the medial-lateral and anterior-posterior standard deviation and speed is shown in Table 3. In Figure 2, data for CoP range in both medial-lateral (A) and anterior posterior (B) direction and mean CoP positions (C: medial-lateral and D: anterior-posterior direction) are presented. The covariant means for age and BMI were 62.5 years and 35.9 kg*m−2 respectively.


Altered visual and feet proprioceptive feedbacks during quiet standing increase postural sway in patients with severe knee osteoarthritis.

Hirata RP, Jørgensen TS, Rosager S, Arendt-Nielsen L, Bliddal H, Henriksen M, Graven-Nielsen T - PLoS ONE (2013)

Representative examples of bidimensional center of pressure (CoP) trajectory for a representative subject from the “severe” (red line) and “less severe” (blue line) group during one minute of quiet standing with eyes closed on the soft (foam) surface.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3750025&req=5

pone-0071253-g001: Representative examples of bidimensional center of pressure (CoP) trajectory for a representative subject from the “severe” (red line) and “less severe” (blue line) group during one minute of quiet standing with eyes closed on the soft (foam) surface.
Mentions: Examples of CoP excursion for representative “severe” and “less severe” patients are illustrated in Figure 1. The data for the medial-lateral and anterior-posterior standard deviation and speed is shown in Table 3. In Figure 2, data for CoP range in both medial-lateral (A) and anterior posterior (B) direction and mean CoP positions (C: medial-lateral and D: anterior-posterior direction) are presented. The covariant means for age and BMI were 62.5 years and 35.9 kg*m−2 respectively.

Bottom Line: Centre of pressure (Cop) standard deviation, speed, range and Cop mean position in both directions (anterior-posterior and medial-lateral) were extracted from the force platform data.The patients were divided into "less severe" (KL 1 and 2, n = 24) and "severe" (KL>2, n = 18) group.THE RESULTS SUPPORT THAT: (i) the postural reorganization under manipulation of the different sensory information is worse in obese KOA patients with severe degeneration and/or high pain intensity when compared with less impaired patients, and (ii) higher pain intensity is related to worse body balance in obese KOA patients.

View Article: PubMed Central - PubMed

Affiliation: Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark.

ABSTRACT

Objective: The objective was to investigate how postural control in knee osteoarthritis (KOA) patients, with different structural severities and pain levels, is reorganized under different sensory conditions.

Methods: Forty-two obese patients (BMI range from 30.1 to 48.7 kg*m(-2), age range from 50 to 74 years) with KOA were evaluated. One minute of quiet standing was assessed on a force platform during 4 different sensory conditions, applied 3 times at random: Eyes open (EO) and eyes closed (EC) standing on firm and soft (foam) surfaces (EO-soft and EC-soft). Centre of pressure (Cop) standard deviation, speed, range and Cop mean position in both directions (anterior-posterior and medial-lateral) were extracted from the force platform data. Structural disease severity was assessed from semiflexed standing radiographs and graded by the Kellgren and Lawrence (KL) score. Pain intensity immediately before the measurements was assessed by numeric rating scale (range: 0-10).

Results: The patients were divided into "less severe" (KL 1 and 2, n = 24) and "severe" (KL>2, n = 18) group. The CoP range in the medial-lateral direction was larger in the severe group when compared with the less severe group during EC-soft condition (P<0.01). Positive correlation between pain intensity and postural sway (range in medial-lateral direction) was found during EC condition, indicating that the higher the pain intensity, the less effective is the postural control applied to restore an equilibrium position while standing without visual information.

Conclusion: THE RESULTS SUPPORT THAT: (i) the postural reorganization under manipulation of the different sensory information is worse in obese KOA patients with severe degeneration and/or high pain intensity when compared with less impaired patients, and (ii) higher pain intensity is related to worse body balance in obese KOA patients.

Show MeSH
Related in: MedlinePlus