Table 3.

Summary of the findings from the eight papers with interventions regarding ultrasound.

Authors	Interventions	Sample Size	Relative Risk Reduction of Pain WOMAC
Boyaci et al., (2013) [38]	Continuous Ultrasound (CU)	n = 33	16%
	Phonophoresis (PhP)	n = 33
Alfredo et al., (2020) [57]	CU	n = 20	6%
	Control Group (C)	n = 20
Özgönenel et al., (2008) [55]	CU	n = 34	18%
	Sham Ultrasound Group (SU)	n = 33
Luksurapan & Boonhong (2013) [53]	CU	n = 23	108%
	PhP	n = 23
Loyola-Sánchez et al., (2012) [59]	Pulsed Ultrasound Group (PU)	n = 14	23%
	Sham Ultrasound Group (SU)	n = 13
Kozanoglu et al., (2003) [61]	CU	n = 30	22%
	Ibuprofen Phonophoresis (PH)	n = 30
Külcü et al., (2009) [62]	CU	n = 15	44%
	SU	n = 15
Karakaş et al., (2020 [56])	CU	n = 39	11%
	C	n = 36