Journal List > Korean J Sports Med > v.31(1) > 1054498

Kim, Hwang, Ko, Min, Park, and Kwon: The Effects of Knee Pain on the Quadriceps Strength, Proprioception and Balance in Patients with Knee Osteoarthritis

Abstract

The purpose of this study was to assess the effects of knee pain on the quadriceps strength, proprioception and balance in subjects with bilateral knee osteoarthritis and the correlation between muscle strength, proprioception, and balance in knee osteoarthritis patients with knee pain. The inclusion criteria were symptomatic and radiographic bilateral knee osteoarthritis (Kellgren-Lawrence grade ≥2), visual analogue scale difference of the both knees ≥2. Thirty three participants (32 women, 1 men: mean age, 59.18 years) underwent assessment of maximal voluntary contraction of quadriceps and hamstring muscles, knee proprioceptive acuity (measure passive joint reposition sense) and balance index using Biodex System 3 isokinetic dynamometer and Biodex balance System. In this study, the more pain knee had weaker quadriceps strength than less pain knee (p<0.05) but proprioceptive acuity and balance index did not show significant differences in both knees (p>0.05). Poor proprioception was associated with low quadriceps strength and poor Mediolateral Stability Index (p<0.05). Future studies needed to account the influence of pain on neuromuscular factors as well as attempt to further clarify the relationships between these factors.

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Table 1.
General characteristics of patients
Value Patients (n=33)
Age (y) 59.5±4.9
Sex (male/female) 1/32
Body mass index (kg/m2) 23.9±2.7
Dominant leg (right/left) 29/4
More pain knee (right/left) 22/11
Visual analogue scale (cm)  
   More pain knee 5.86±1.64
   Less pain knee 2.54±0.98

Values are presented as mean±standard deviation.

Table 2.
Quadriceps strength according to the extent of pain
Peak extensor torque More pain site Less pain site
Peak extensor torque (ft-lbs)    
   60 o/s 51.63±12.83* 57.78±11.14
   180 o/s 30.31±8.13* 33.52±6.25
Peak flexor torque (ft-lbs)    
   60 o/s 26.15±9.22 27.63±8.66
   180 o/s 18.47±6.64 20.63±6.36

Values are presented as mean±standard deviation.

* Statistically significant.

Table 3.
Proprioceptive acuity according to the extent of pain
Proprioceptive acuity (degrees error) More pain site Less pain site
90 o to 15 o 3.36±1.42 2.92±1.53
90 o to 30 o 4.27±1.92 3.71±1.62
90 o to 45 o 4.48±2.49 4.26±2.19

Values are presented as mean±standard deviation.

Table 4.
Balance index according to the extent of pain
Stability index More pain site Less pain site
Overall 3.56±1.07 3.50±1.03
Anteroposterior 3.07±0.91 3.18±1.07
Mediolateral 1.84±0.71 1.77±0.51

Values are presented as mean±standard deviation.

Table 5.
Correlation between quadriceps strength, proprioceptive acuity and balance in knee osteoarthritis patients with knee pain
Proprioceptive acuity 90 o to 15 o 90 o to 30 o 90 o to 45 o
CC p-value CC p-value CC p-value
PET 60 o/s 0.347 0.048* 0.081 0.654 0.102 0.572
PET 180 o/s −0.052 0.774 −0.100 0.579 −0.233 0.191
Overall stability index 0.240 0.179 0.068 0.707 −0.250 0.160
Anteroposterior stability index 0.170 0.344 0.055 0.762 −0.106 0.555
Mediolateral stability index 0.098 0.586 0.000 0.999 −0.344 0.050*

CC: correlation coefficient, PET: peak extensor torque.

* Statistically significant.

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