Quality of knee strengthening exercises performed at home deteriorates after one week

Table 2 Hip and knee joint angles measured during the 1st and 2nd. Several joint angles significant differed between the two visits, indicating that subjects were unable to consistently replicate rehabilitation exercises seven days after being taught by a physical therapist

	Exercises	Dependent Variable	Joint Angle, Mean (SD)		p value	MDC (°)
	Exercises	Dependent Variable	1st visit	2nd visit	p value	MDC (°)
Peak Angle	Knee Flexion	Knee Flexion/Extension^a	117.3 (12.2)	116.1 (14.3)	0.69	26.9
Peak Angle	SLR	Knee Flexion/Extension^a	−7.7 (5.5)	−10.8 (6.0)	0.02*	10.9
Average Angle	SLR	Knee Flexion	2.1 (4.6)	6.4 (4.9)	< 0.01*	10.6
	V “Out”	Knee Flexion	4.4 (5.6)	7.3 (5.2)	0.11	6.2
	V “Out”	Hip IR (+)/ER(−)	12.4 (19.0)	−16.3 (29.4)	< 0.01*	60.6
	V “In”	Knee Flexion	3.4 (3.3)	8.4 (3.8)	< 0.01*	14.7
	V “In”	Hip IR (+)/ER(−)	−46.1 (12.5)	−12.5 (30.2)	< 0.01*	64.0
	“Jane Fonda”	Knee Flexion	1.6 (5.8)	5.3 (9.5)	0.07	9.1
	“Jane Fonda”	Hip Flexion	8.3 (9.4)	13.0 (12.8)	0.13	19.4

Peak angles represent the peak within each trial. Average angles represent the average angle across the entire trial. ^aZero degrees represent anatomical position; positive knee angles indicate knee flexion and negative values indicate hyperextension; zero degrees represents anatomical position. * significant difference between 1st and 2nd visit. SD standard deviation, SLR straight leg raise, MDC minimal detectable change

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