Table 1.

Patient Characteristics and Data.

No.	Instrum entation failure	Age (yr.)	Sex	Radiation therapy	Resection level	Op.time (min)	Bleeding (ml)	Length of resected vertebrae (mm)	Cage subsidence (mm)		End cap use	Follow-up period	Onocological status
									One month	One year
1	-	77	F	-	(C7), T1, (T2)	558	1940	26	0	0	-	55	AWD
2	-	33	F	-	C7, T1, T2, (T3)	1618	4950	55	0	0	-	95	NED
3	-	55	M	-	(T1), T2, (T3)	631	750	45	2	2	-	31	DOD
4	-	48	M	+	(T1), T2, (T3)	765	1590	59	0	0	-	54	NED
5	-	42	M	-	(C7), T1, T2, T3, (T4)	1017	4000	52	8	8	-	97	NED
6	-	66	F	+	T2, T3, T4	627	700	55	2	2	+	32	DOD
7	-	49	M	-	T2, T3, T4	530	1930	65	2	2	-	72	NED
8	-	49	M	-	(T3), T4, (T5)	731	1710	38	6	6	-	52	DOD
9	-	50	M	-	(T3), T4, (T5)	630	2000	30	2	5	+	81	AWD
10	-	50	M	-	(T4), T5	465	1980	33	0	0	-	70	DOD
11	-	50	M	-	T4, T5, (T6)	557	2460	52	4	4	-	24	DOD
12	-	62	M	+	(T4), T5, (T6)	503	730	45	1	1	+	94	AWD
13	+	58	M	-	(T5), T6	445	1100	37	2	11	-	117	NED
14	-	39	F	-	(T5), T6, (T7)	625	1100	28	2	2	-	116	AWD
15	-	67	M	-	T6, T7	397	1660	41	0	0	+	74	AWD
16	-	41	F	-	T5, T6, T7, (T8)	524	820	63	2	2	-	17	DOD
17	-	58	F	-	(T6), T7, (T8)	445	1100	34	0	0	+	123	NED
18	-	52	F	-	(T6), T7, (T8)	505	2875	38	1	3	+	67	DOD
19	-	50	F	-	T6, T7, T8	565	550	66	6	6	+	83	AWD
20	-	59	F	+	(T6), T7, T8	432	360	48	2	4	+	84	AWD
21	-	34	F	+	(T6), T7, T8	685	1400	45	2	3	+	49	DOD
22	-	66	M	-	(T7), T8, T9	510	1050	66	0	0	+	50	DOD
23	-	71	F	-	(T8), T9	417	1200	30	0	4	+	75	NED
24	-	80	M	+	(T8), T9, (T10)	580	1200	48	0	3	+	90	NED
25	-	47	F	+	T9, T10, T11	566	1340	85	1	1	+	71	DOD
26	-	62	F	-	T10, T11	424	1070	52	0	0	+	72	AWD
27	-	66	M	-	(T10), T11	655	1645	40	0	1	+	112	NED
28	+	40	M	-	(T8), T9, T10, T11, (T12)	748	780	111	2	2	+	94	AWD
29	-	57	F	-	(T10), T11, (T12)	391	1450	42	2	2	+	68	DOD
30	-	62	M	-	(T9), T10, T11, T12, (L1)	683	900	124	1	5	+	42	DOD
31	-	62	F	+	(T11), T12, (L1)	567	650	44	0	0	+	41	AWD
32	-	61	M	-	(T11), T12, L1	592	650	86	0	3	+	89	NED
33	-	70	F	+	T12, L1	515	870	57	0	0	+	48	AWD
34	-	32	F	-	(T12), L1	488	1300	36	0	0	+	91	NED
35	-	58	F	-	(T12), L1, (L2)	500	650	47	0	3	+	92	AWD
36	+	60	M	+	T12, L1, (L2)	875	1410	73	0	7	+	70	NED
37	+	46	F	-	T12, L1, (L2)	655	1600	75	5	10	+	28	NED
38	-	59	F	-	T12, L1, L2	753	2050	120	2	2	+	84	AWD
39	-	52	M	+	T12, L1, L2	1185	5530	120	0	0	+	24	DOD
40	+	57	M	+	(T12), L1, L2	760	2010	105	0	5	+	87	DOD
41	-	50	F	-	(L1), L2, (L3)	713	680	42	0	0	+	94	DOD
42	-	38	F	-	(L1), L2, (L3)	596	690	49	2	3	+	60	NED
43	+	63	F	+	(L2), L3, L4	531	1800	111	2	10	+	95	NED
44	-	52	F	+	L3, L4	583	980	74	0	0	+	106	AWD
45	+	37	F	-	L3, L4, (L5)	660	2540	82	3	3	+	39	NED
46	+	32	F	-	(L3), L4, (L5)	679	2000	58	2	2	+	79	NED
47	-	36	F	-	L3, L4, L5	1516	5510	103	2	2	+	61	NED

NED: no evidence of disease, AWD: alive with disease, DOD: dead of disease