Table 3.

The frequency of bone cement leakage into the spinal canal

	T6	T7	T8	T9	T10	T11	T12	L1	L2	L3	L4	L5	Total
Single vertebra	6	4	12	8	20	32	41	39	30	16	15	11	234
Double vertebrae	5	7	8	11	13	8	30	24	22	16	11	9	164
Three vertebrae	2	5	3	5	9	11	10	9	5	2	1	1	63
Four vertebrae	1	2	3	3	5	8	11	8	5	3	1	2	52
Five vertebrae	1	2	2	2	3	5	6	4	4	1	3	2	35
Total	15	20	28	29	50	64	98	84	66	38	31	25	548
The amounts of bone cement leakage(n)	1	2	2	3	5	7	11	5	2	1	1	0	40
The rates of bone cement leakage (%)	6.7	10.0	7.1	10.3	10.0	10.9	11.2	5.9	3.0	2.7	3.2	0	7.3