Correlação entre as oscilações posturais em diferentes superfícies e hiperalgesia secundária em indivíduos com osteoartrite de joelho

Abstract

Background Knee osteoarthritis (KOA) is a progressive degenerative joint disease. Pain is the main limiting factor, which may occur at sites far from the knee joint (secondary hyperalgesia). KOA is associated with reduced proprioception and neuromuscular control, both factors that influence the maintenance of balance. The correlation between secondary hyperalgesia and postural sway in OAJ subjects has not yet been clarified. Objective The present study aimed to verify the correlation between postural sway on different surfaces and secondary hyperalgesia in individuals with mild and moderate KOA Methods Thirty individuals (21 women) with mild and moderate degrees of knee osteoarthritis, aged 50 to 70 years old participated in the study. The pressure pain threshold (PPT) was evaluated using the digital force sensor (Force TEN ™) at 21 points, being dermatomes, myotomes and sclerotomes. Static balance was evaluated through the BIOMEC 400 force platform in four distinct conditions: firm surface with open eyes (FSOE); firm surface with closed eyes (FSCE), soft surface with open eyes (SSOE) and soft surface with closed eyes (SSCE). Results Moderate and weak correlations were found between PPT and the mean of anteroposterior displacement (MAP) in the first three conditions of the force platform and moderate and weak correlations between the velocity of medio-lateral displacement (MLV) and LDP in the condition of FSOE. No positive correlations were found between PPT and SSCE. Conclusion The present results associate both primary and secondary hyperalgesia with larger postural sway in KOA subjects.