Intragroup comparison of clinical improvements

Variables TENS (n = 19) IFC (n = 18) Placebo TENS (n = 18) Placebo IFC (n = 18)
Mean ± SD P value Mean ± SD P value Mean ± SD P value Mean ± SD P value
VAS
Initial 7.78 ± 1.43 7.72 ± 1.27 7.83 ± 1.72 7.66 ± 1.53
2nd wk 3.78 ± 1.35 < 0.001a 3.61 ± 1.61 < 0.001a 3.88 ± 2.05 < 0.001a 4.77 ± 1.95 < 0.001a
3rd mo 5.00 ± 1.59 < 0.001b 5.27 ± 1.40 < 0.001b 5.50 ± 2.40 < 0.001b 6.61 ± 1.14 0.015b
WOMAC
Initial 56.97 ± 15.67 57.49 ± 10.00 55.37 ± 19.53 52.59 ± 18.14
2nd wk 32.91 ± 15.35 < 0.001a 29.19 ± 14.07 < 0.001a 32.65 ± 17.97 < 0.001a 35.49 ± 18.76 < 0.001a
3rd mo 39.30 ± 15.09 < 0.001b 42.08 ± 10.41 < 0.001b 38.91 ± 21.02 < 0.001b 44.78 ± 20.39 0.043b
PCS
Initial 19.36 ± 17.92 21.00 ± 11.23 23.11 ± 16.52 20.88 ± 11.80
2nd wk 13.42 ± 17.64 < 0.001a 13.11 ± 13.76 0.003a 16.77 ± 15.90 < 0.001a 14.66 ± 8.84 0.005a
3rd mo 15.42 ± 17.46 < 0.001b 17.88 ± 11.46 0.005b 17.83 ± 16.21 0.039b 18.05 ± 11.07 0.008b
TUG (sec)
Initial 11.12 ± 3.71 10.44 ± 2.15 10.67 ± 4.08 8.57 ± 1.13
2nd wk 9.40 ± 3.43 < 0.001a 9.06 ± 2.83 0.024a 9.44 ± 2.92 0.017a 7.73 ± 1.00 < 0.001a
3rd mo 9.99 ± 3.66 < 0.001b 9.97 ± 2.31 < 0.001b 10.04 ± 3.52 < 0.001b 8.32 ± 1.30 0.045b
TSK
Initial 38.21 ± 5.08 32.26 ± 8.70 33.61 ± 8.73 38.05 ± 5.81
2nd wk 34.52 ± 3.67 < 0.001a 30.63 ± 8.54 0.014a 31.94 ± 8.25 0.005a 35.55 ± 5.70 0.030a
3rd mo 35.26 ± 4.02 < 0.001b 31.47 ± 8.80 0.015b 32.77 ± 8.53 0.048b 36.77 ± 6.00 0.040b

n: number of patients, SD: standard deviation, TENS: transcutaneous electrical nerve stimulation, IFC: interferential current, VAS: visual analog scale (0–10), WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index, PCS: pain catastrophizing scale, TUG: Timed Up and Go test, TSK: Tampa Scale of Kinesiophobia.

aComparison between initial and 2nd week, bComparison between the 2nd week and 3rd month.

Korean J Pain 2023;36:392~403 https://doi.org/10.3344/kjp.23118
© Korean J Pain