Table 2. Comparison of Incidence of Anterior Knee Pain and Patellofemoral Crepitus between the Two Groups.

Variable			Attune	PFC Sigma	p-value
Anterior knee pain
	Preoperative				0.7
		Yes	59	57
		No	13	15
	3 Months				0.9
		Yes	25	23
		No	47	49
	12 Months				0.8
		Yes	8	7
		No	64	65
	2 Years				1.0
		Yes	1	1
		No	71	71
Patellofemoral crepitus
	Preoperative				0.7
		Yes	27	24
		No	45	48
	3 Months				0.8
		Yes	9	7
		No	63	65
	12 Months				1.0
		Yes	3	3
		No	69	69
	2 Years				1.0
		Yes	1	1
		No	71	71