Mid-term outcomes of a kinematically designed cruciate retaining total knee arthroplasty

Table 7 Patient reported outcome measures (mean ± SD)

	Knees (n = 255)	P value
KOOS JR
Preoperative	43.3 (13.0)
6 mo	56.5 (16.1)
2 yr	62.2 (13.9)
Δ Preop to 6 mo	13.2 (16.4)	< 0.0001
Δ Preop to 2 yr	18.9 (16.9)	< 0.0001
PROMIS pain intensity
Preoperative	55.6 (6.9)
6 mo	50.1 (8.1)
2 yr	48.6 (7.6)
Δ Preop to 6 mo	-5.5 (8.2)	< 0.0001
Δ Preop to 2 yr	-7.0 (6.7)	< 0.0001
PROMIS pain interference
Preoperative	65.3 (5.7)
6 mo	61.4 (8.0)
2 yr	59.5 (8.0)
Δ Preop to 6 mo	-3.9 (7.5)	< 0.0001
Δ Preop to 2 yr	-5.8 (6.3)	< 0.0001
PROMIS mobility
Preoperative	35.5 (4.1)
6 mo	38.1 (4.3)
2 yr	40.3 (5.6)
Δ Preop to 6 mo	2.6 (4.8)	< 0.0001
Δ Preop to 2 yr	4.8 (3.5)	< 0.0001
PROMIS physical health
Preoperative	39.5 (7.3)
6 mo	41.8 (6.9)
2 yr	42.0 (6.1)
Δ Preop to 6 mo	2.3 (6.6)	0.029
Δ Preop to 2 yr	2.5 (5.4)	0.045

KOOS JR: Knee Injury and Osteoarthritis Outcome Score for Joint Replacement; PROMIS: Patient-Reported Outcomes Measurement Information System.