Table 4. Factors of poor prognosis by using Cox regression.

Events	Poor prognosis				Meniscus tear				Osteoarthritis				Total knee replacement
Group	Adjusted HR	95% CI	95% CI	P	Adjusted HR	95% CI	95% CI	P	Adjusted HR	95% CI	95% CI	P	Adjusted HR	95% CI	95% CI	P
Without cruciage ligament reconstruction	Reference				Reference				Reference				Reference
With cruciage ligament reconstruction	0.468	0.341	0.642	<0.001	0.172	0.126	0.236	0.012	0.686	0.500	0.941	0.001	0.293	0.214	0.402	<0.001
Without cruciage ligament reconstruction	Reference				Reference				Reference				Reference
Time to cruciage ligament reconstruction: < 1month	0.390	0.284	0.535	<0.001	0.000	1.256×10−18	798.675	0.798	0.661	0.482	0.907	0.011	0.319	0.232	0.437	0.001
Time to cruciage ligament reconstruction: >1 month, <1 year	0.546	0.398	0.748	<0.001	0.000	2.421×10−17	370.244	0.598	0.941	0.686	1.291	0.217	0.000	3.786×10−20	1,316.752	0.768
Time to cruciage ligament reconstruction: ≥1 year, <3 years	2.404	1.752	3.298	0.002	3.526	2.569	4.837	0.006	2.489	1.813	3.414	0.001	2.115	1.541	2.902	0.001
Time to cruciage ligament reconstruction: ≥ 3 years	2.615	1.905	3.587	0.011	6.392	4.657	8.768	0.007	0.000	9.856×10−19	1,006.243	0.682	0.000	5.362×10−20	2,047.866	0.844

HR = hazard ratio, CI = confidence interval, Adjusted HR: Adjusted for the variables listed in Table 3.