Table 2. Relationship of radiographic synovial effusion in the index stifle to contralateral cranial cruciate ligament rupture at one and two years after surgery.

One year after surgery
Effusion Grade	Ruptured	Not ruptured	Odds ratio	95% CI	Significance
0	0	1	1.25	0.05–31.98	p = 0.89
1	2	6	1.33	0.24–7.28	p = 0.74
2	15	59	0.89	0.17–4.73	p = 0.89
Two years after surgery
0	0	1	0.61	0.02–15.72	p = 0.77
1	2	5	0.74	0.13–4.16	p = 0.73
2	20	36	1.67	0.31–9.04	p = 0.55

Note: At one year after surgery, n = 83 dogs; 2 dogs were censored at <365 days. Overall, radiographic synovial effusion in the index stifle was not significantly associated with risk of rupture at 1 year (p = 1.0). At two years after surgery, n = 64 dogs; 21 dogs were censored at <730 days. Overall, radiographic synovial effusion in the index stifle was not significantly associated with risk of rupture at 2 years (p = 1.0).