Table 2. The validity of OpenPose-based motion-analysis system for measuring the frontal angles of the hip and knee joints compared with three-dimensional motion analysis (n=8)

Weight-bearing activity	Range of motion	Correlation coefficient (P value)
		MSL	LSL
Standing hip abduction with the MSL	Hip abduction	0.606 (0.11)+	0.344 (0.40)#
	Knee abduction	–0.314 (0.45)#	0.765 (0.03)#*
Standing hip abduction with the LSL	Hip abduction	0.390 (0.34)+	0.500 (0.21)#
	Knee abduction	–0.036 (0.93)#	0.476 (0.23)#
Semi-squats	Hip adduction	0.253 (0.55)+	0.550 (0.16)+
	Knee abduction	0.400 (0.33)+	0.318 (0.44)+
Stepping down with the MSL	Hip adduction	0.632 (0.09)+	–0.091 (0.83)+
	Knee abduction	0.287 (0.49)#	–0.882 (0.01)#*
Stepping down with the LSL	Hip adduction	0.395 (0.33)#	–0.024 (0.96)#
	Knee abduction	–0.477 (0.12)#	0.417 (0.22)#

Pearson correlation coefficient;
Spearman correlation coeeficient;
P<0.05.
Abbreviations: MSL, more symptomatic leg; LSL, less symptomatic leg.