TABLE III.

Functional Outcomes of Nonsurgically and Surgically Treated Patients from Baseline to the Two-Year Follow-up Evaluation

	Baseline*		6 Wk*		2 Yr*			Standardized Response Mean from Baseline to 2 Yr		P Value
	Nonsurgical	Surgical	Nonsurgical	Surgical	Nonsurgical	Surgical	Time P Value	Nonsurgical	Surgical	Group × Time	Propensity-Score-Adjusted Group × Time
IKDC-2000 score	72.8 ± 11.3	69.8 ± 11.5	80.4 ± 10.4	77.8 ± 11.2	89.2 ± 11.3	88.9 ± 12.1	<0.001	1.06	1.21	0.650	0.261
Knee extension strength
Uninvolved (Nm)	186.8 ± 46.3	193.6 ± 52.3	195.1 ± 49.6	204.4 ± 52.5	198.4 ± 55.4	213.1 ± 55.3	<0.001	0.49	0.59	0.472	0.788
Involved (Nm)	167.1 ± 43.0	171.7 ± 48.1	180.8 ± 45.4	190.0 ± 49.3	190.3 ± 51.1	200.9 ± 55.5	<0.001	0.84	0.86	0.676	0.906
Limb symmetry (%)	90.0 ± 10.9	89.0 ± 10.5	93.2 ± 8.0	93.5 ± 10.6	96.4 ± 9.8	99.2 ± 15.2	<0.001	0.43	0.46	0.664	0.448
Knee flexion strength
Uninvolved (Nm)	95.4 ± 29.1	95.9 ± 26.1	101.2 ± 29.1	104.4 ± 26.3	104.5 ± 31.9	108.6 ± 29.2	<0.001	0.55	0.73	0.408	0.638
Involved (Nm)	88.8 ± 26.2	91.3 ± 25.8	98.3 ± 26.8	101.8 ± 26.9	102.6 ± 29.0	102.6 ± 29.3	<0.001	0.80	0.60	0.413	0.689
Limb symmetry (%)	94.9 ± 15.2	95.7 ± 12.4	97.9 ± 10.8	97.7 ± 10.6	99.2 ± 15.2	94.7 ± 11.5	0.257	0.21	−0.08	0.165	0.924

^*The values are given as the mean and standard deviation and represent the patients for whom data were available at the time of follow-up. IKDC-2000 scores were available for forty-one nonsurgically treated patients and eighty-six surgically treated patients (one patient did not return for the six-week assessment). Knee extension and flexion strength data were available for forty nonsurgically treated patients and eighty-one surgically treated patients (two patients did not return for the six-week assessment).