Table 1. Characteristics of patients with or without PCL injury.

Posterior cruciate ligament	Total		With		Without		P
Variables	n	%	n	%	n	%
Total	20,845		4,169	20.00	16,676	80.00
Sex							0.999
Male	14,765	70.83	2,953	70.83	11,812	70.83
Female	6,080	29.17	1,216	29.17	4,864	29.17
Age (years)	32.54±17.94		32.15±12.65		32.64±19.03		0.115
Age group (years)							0.999
18–24	8,815	42.29	1,763	42.29	7,052	42.29
25–49	9,585	45.98	1,917	45.98	7,668	45.98
≥50	2,445	11.73	489	11.73	1,956	11.73
Poor prognosisa							<0.001
Without	20,332	97.54	4,008	96.14	16,324	97.89
With	513	2.46	161	3.86	352	2.11
Meniscus tear							<0.001
Without	20,761	99.60	4,122	98.87	16,639	99.78
With	84	0.40	47	1.13	37	0.22
Osteoarthritis							0.001
Without	20,415	97.94	4,056	97.29	16,359	98.10
With	430	2.06	113	2.71	317	1.90
Total knee replacement							0.041
Without	20,704	99.32	4,131	99.09	16,573	99.38
With	141	0.68	38	0.91	103	0.62

a. Poor prognosis include meniscus tear, osteoarthritis and total knee replacement.