Table 1.

Patient data

Patient no.	Sex	Age	Disease	Surgery date	Cemented screw	Uncemented screw	FU period (mos)	Note
1	M	66	Degenerative disease	12/09/2006	1	9	52
2	F	76	Tumor (myeloma)	11/12/2006	4	0	48	Cauda syndrome
3	F	68	Post-traumatic kyphosis	17/01/2007	2	7	48
4	M	73	Tumor (prostate)	24/02/2007	4	0	13	DOD
5	M	85	Fracture	10/05/2007	4	8	44	Superficial infections, deep vein thrombosis
6	F	57	Failure of previous surgery	25/05/2007	4	6	43
7	F	75	Failure of previous surgery	05/06/2007	1	11	42
8	F	56	Degenerative disease	08/06/2007	7	5	41	Surgical revision
9	M	57	Failure of previous surgery	11/06/2007	10	8	40	Superficial infections, transient cerebral ischemia
10	M	62	Tumor (prostate)	13/06/2007	4	2	36
11	M	70	Failure of previous surgery	17/08/2007	2	10	38	Cement leakage
12	F	76	Tumor (hypernephroma)	31/08/2007	4	4	36	Cement leakage
13	F	77	Fracture	22/09/2007	4	0	40
14	F	58	Tumor (breast)	09/11/2007	3	4	24	DOD
15	F	79	Tumor (breast)	07/02/2008	4	2	34
16	F	70	Tumor (breast)	13/02/2008	4	4	34
17	M	72	Post-traumatic kyphosis	27/02/2008	4	6	36	System removal
18	M	55	Tumor (myeloma)	13/03/2008	4	0	33
19	M	55	Tumor (myeloma)	31/03/2008	4	0	30
20	M	58	Failure of previous surgery	09/04/2008	2	8	32
21	F	66	Tumor (hypernephroma)	14/04/2008	5	0	21	DOD