TABLE 3.

SF-12 Composite Scores for Each Knee Injury Classification, Preinjury Through 12 Months Postinjury^a

Injury	PCS, Mean ± SD	Change From Preinjury			MCS, Mean ± SD	Change From Preinjury
		Mean	95% CI	P		Mean	95% CI	P
ACL (n = 99)
Preinjury	56.72 ± 3.78	—	—	—	56.65 ± 7.19	—	—	—
Diagnosis	39.94 ± 10.74	−16.78	−18.72, −14.84	<.001	50.42 ± 11.95	−6.08	−8.26, −3.90	<.001
3 mo	45.56 ± 8.41	−11.14	−13.13, −9.16	<.001	52.44 ± 10.43	−4.00	−6.24, −1.76	<.001
6 mo	51.16 ± 6.44	−5.51	−7.49, −3.54	<.001	53.15 ± 8.51	−3.32	−5.54, −1.10	.004
12 mo	53.92 ± 5.33	−2.79	−4.74, −0.85	.005	54.73 ± 6.75	−1.77	−3.95, 0.41	.111
AKP (n = 63)
Preinjury	54.38 ± 6.76	—	—	—	54.95 ± 6.68	—	—	—
Diagnosis	43.65 ± 10.07	−10.73	−13.25, −8.21	<.001	50.86 ± 10.53	−4.09	−6.85, −1.34	.004
3 mo	50.31 ± 9.57	−4.12	−6.69, −1.55	.002	53.47 ± 8.98	−1.49	−4.30, 1.32	.298
6 mo	53.59 ± 7.72	−0.82	−3.35, 1.71	.523	52.96 ± 9.20	−1.96	−4.73, 0.81	.164
12 mo	54.19 ± 6.81	−0.19	−2.71, 2.33	.880	52.83 ± 8.21	−2.12	−4.87, 0.64	.132
PAT (n = 36)
Preinjury	55.74 ± 3.94	—	—	—	57.51 ± 5.55	—	—	—
Diagnosis	39.33 ± 11.48	−16.41	−19.77, −13.05	<.001	51.02 ± 12.53	−6.50	−10.12, −2.87	.001
3 mo	49.95 ± 10.01	−5.72	−9.26, −2.17	.002	52.52 ± 9.80	−5.41	−9.24, −1.58	.006
6 mo	52.85 ± 6.64	−3.15	−6.57, 0.26	.070	54.30 ± 7.35	−2.86	−6.55, 0.82	.127
12 mo	54.14 ± 6.16	−1.59	−4.96, 1.77	.350	53.09 ± 8.19	−4.42	−8.05, −0.80	.017
MNT (n = 16)
Preinjury	57.50 ± 3.32	—	—	—	54.09 ± 11.64	—	—	—
Diagnosis	41.02 ± 9.80	−16.48	−21.43, −11.53	<.001	48.16 ± 9.90	−5.92	−11.87, 0.03	.051
3 mo	50.39 ± 8.82	−7.11	−12.06, −2.16	.006	54.13 ± 8.64	0.04	−5.91, 5.99	.989
6 mo	53.93 ± 8.55	−3.57	−8.52, 1.38	.155	51.97 ± 5.89	−2.12	−8.07, 3.83	.479
12 mo	55.59 ± 4.10	−1.91	−6.86, 3.04	.443	53.85 ± 5.48	−0.24	−6.19, 5.72	.937
ITB (n = 12)
Preinjury	55.09 ± 4.74	—	—	—	56.43 ± 5.33	—	—	—
Diagnosis	46.55 ± 7.06	−8.55	−13.71, −3.39	.002	48.78 ± 12.29	−7.66	−13.75, −1.56	.015
3 mo	49.08 ± 8.50	−5.96	−11.39, −0.54	.032	53.07 ± 7.03	−3.18	−9.62, 3.25	.323
6 mo	53.32 ± 3.73	−1.95	−7.37, 3.47	.471	52.55 ± 7.63	−3.95	−10.38, 2.49	.222
12 mo	54.40 ± 7.07	−0.70	−5.85, 4.46	.786	48.89 ± 8.61	−7.54	−13.64, −1.45	.017
COL (n = 11)
Preinjury	55.00 ± 4.31	—	—	—	55.51 ± 6.59	—	—	—
Diagnosis	37.33 ± 13.86	−17.67	−25.74, −9.59	<.001	51.61 ± 12.80	−3.90	−11.66, 3.85	.314
3 mo	52.02 ± 6.68	−2.89	−10.79, 5.01	.463	51.63 ± 11.19	−4.61	−12.24, 3.02	.228
6 mo	50.34 ± 11.14	0.76	−7.34, 8.86	.850	51.35 ± 11.16	−9.19	−17.05, −1.34	.023
12 mo	51.44 ± 11.34	−3.56	−11.63, 4.51	.377	51.32 ± 12.61	−4.19	−11.95, 3.56	.280
OTH (n = 6)
Preinjury	56.39 ± 0.78	—	—	—	62.01 ± 0.93	—	—	—
Diagnosis	44.36 ± 5.51	−12.03	−22.08, −1.98	.021	52.93 ± 10.29	−9.08	−16.49, −1.67	.019
3 mo	40.17 ± 16.0	−16.23	−26.27, −6.18	.003	55.20 ± 5.25	−6.81	−14.22, 0.60	.070
6 mo	53.95 ± 4.72	−2.44	−12.49, 7.61	.618	57.22 ± 4.76	−4.80	−12.21, 2.62	.192
12 mo	55.38 ± 6.23	−1.01	−11.06, 9.03	.836	57.11 ± 7.44	−4.90	−12.31, 2.52	.183

^aACL, anterior cruciate ligament tear; AKP, anterior knee pain; CI, confidence interval; COL, collateral ligament sprain; ITB, iliotibial band syndrome; MCS, mental component summary of the SF-12; MNT, meniscus tear; OTH, other; PAT, patellar instability; PCS, physical component summary of the SF-12; SD, standard deviation; SF-12, Short Form–12.