Article

Osteoarthritis (OA) is a chronic degenerative disease that commonly
affects the knee joints. Individuals older than 65 years of age with knee OA have
a greater risk of falls.
However, there has been limited examination of the
parameters of postural sway (increased time, speed, and postural sway area
[center of pressure{CoP}]),
and OA of the knee. OBJECTIVES:
The primary objective
of this study was to determine whether the CoP variables discriminate between
patients with knee OA and matched healthy volunteers,
and to correlate the CoP
variables with the Activities-Specific Balance Confidence Scale (ABC) and Falls
Self-Efficacy Scale (FES). The secondary objective was to compare the CoP of
older women with OA with a control group in bipedal support condition with eyes
opened and closed. DESIGN: Cross-sectional study. SETTING: University
Biomechanics Laboratory. PARTICIPANTS: A total of 22 participants were divided
into the following 2 groups of 11 participants each: an OA group (mean = 68
years, standard deviation = 7.4 years) and a control group (mean = 66 years,
standard deviation = 4.4 years). METHODS: Static postural balance was measured by
a portable force platform. Data were collected in both visual conditions (eyes
open and closed), in random order. Three attempts of 30 seconds were allowed for
each participant on the force platform, with a 1-minute interval between
attempts. MAIN OUTCOME MEASURE: Variables were the CoP total displacement of sway
(TDS, in centimeters), anteroposterior amplitude displacement (APAD, in
centimeters), medial-lateral amplitude displacement (MLAD, in centimeters), total
mean velocity (TMV, in centimeters per second), and dispersion of the center of
pressure (AREA, in centimeters squared). RESULTS: The postural sway analysis
found statistically significant differences in the eyes open condition for the
TDS (P = .020), APAD (P = .042), TMV (P = .010), and AREA (P = .045). In the
discriminant analysis, none of the CoP variables were able to classify the groups
(P = .15). The correlation analysis showed that only the AREA with eyes closed
was associated with the ABC Scale (rho = -0.42). CONCLUSIONS: Women with knee OA
had greater postural sway when compared with a control group for the eyes open
condition. CoP variables could not discriminate between the groups. The AREA was
negatively correlated with the ABC Scale, when the eyes were closed. LEVEL OF EVIDENCE: III.
CI - Copyright (c) 2017 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS