[Purpose] The aim of study was to compare different durations of
ultrasound in patients with knee osteoarthritis. [Subjects and Methods] One hundred
patients diagnosed with bilateral knee osteoarthritis (OA) were enrolled in this study.
Patients were divided into two groups. The first group (G1) received 4 minutes of
ultrasound. The second group (G2) received the exact same treatment, but the duration of
ultrasound was longer at 8 minutes. Patients in both groups underwent a total of 10
ultrasound over 2 weeks. Following treatment, all patients provided self-evaluations of
pain via the Visual Analog Scale (VAS), overall physical function with WOMAC, disability
via the Lequesne index (Leq), and depressive symptoms with the Beck Depression Index
(BDI). [Results] There were no significant differences in VAS, WOMAC Leq, and BDI values
between groups 1 and 2. After treatment, VAS, WOMAC, Leq, and BDI values improved for both
treatment groups. However, following treatment, G2 had significantly greater values for
WOMAC functional and total scores than G1. No statistically significant differences were
observed for VAS scores while inactive, WOMAC pain and stiffness scores, and BDI values
after treatment between both groups. VAS pain scores while active and Leq index values
were significantly lower in G1 than G2. [Conclusion] Patients in both groups demonstrated
improved functionality, pain and psychological status following a consistent, 2-week
regimen of 4-minute or 8-minute treatments with ultrasound. Yet, patients that experienced
longer treatment durations of 8 minutes demonstrated better outcomes in pain and the
ability to carry out activities of daily living.