Table 2.

Summary of the findings from the seven papers with interventions regarding exercise therapy, sample size, and the relative risk reduction for WOMAC pain subscale.

Authors	Interventions	Sample Size	Relative Risk Reduction of Pain WOMAC
Vincent et al., (2019) [46]	Concentric	n = 28	11.3%
	Eccentric	n = 30	16.9%
Hall et al., (2018) [47]	Isometric	n = 49	8.4%
	No Intervention	n = 48
Hafez et al., (2013) [48]	Pre strengthening exercises	n = 20	46.1%
	Post strengthening exercises
Al-Johani et al., (2014) [49]	Conservative PT+ strengthening exercises	n = 20	27.7%
	Versus conservative PT	n = 20
Oliveira et al., (2012) [50]	Instructions	n = 50	11%
	Versus quadricep strengthening	n = 50
Lin et al., (2009) [51]	Strengthening exercises	n = 36	42.1%
	No intervention	n = 36
O’Reilly et al., (1999) [52]	Strengthening exercises	n = 108	30.3%
	No intervention	n = 72