Multilevel thoracic ossification of ligamentum flavum coexisted with/without lumbar spinal stenosis: staged surgical strategy and clinical outcomes

Table 2 Summary of operative data obtained in the 11 patients of multilevel TOLF

Surgical Sequence		Time Interval between Two Operations	Operated Levels		Number of Operated Levels		Operation Time (min)		Operation Time per Level (min)		Blood Loss (ml)		Blood Loss per Level (ml)		Hospital Stays (days)		Complications
Surgical Sequence		Time Interval between Two Operations	1^st Stage	2^nd Stage	1^st Stage	2^nd Stage	1^st Stage	2^nd Stage	1^st Stage	2^nd Stage	1^st Stage	2^nd Stage	1^st Stage	2^nd Stage	1st Stage	2^nd Stage	1^st Stage	2^nd Stage
1	LL	34	T9-T11	T2-T4	3	3	280	270	93.3	90	600	1600	200	533	35	19	N	N
2	UL	6	T8-T11	L3-L5	4	3	175	115	43.8	38.3	500	250	125	83	15	13	N	N
3	UL	1	T1-T3	T4-T9	3	6	150	234	50	39	400	800	133	133	10	25	N	N
4	LL	37	T4-T11	T1-T2	8	2	400	245	50	122.5	1200	1500	150	750	23	19	N	CSF leakage
5	LL	6	L2-L5	T4-T10	4	7	140	230	35	32.9	700	1200	175	171	23	18	CSF leakage	CSF leakage
6	LL	5	T5-T12	T2-T4	8	3	310	205	38.9	68.3	1500	500	188	167	14	15	CSF leakage	CSF leakage
7	LL	5	L2-L5	T9-T10	4	2	230	175	57.5	87.5	800	800	200	400	15	22	N	N
8	UL	5	T3-T4	T9-T12	2	4	295	235	147.5	58.8	2000	1000	1000	250	13	26	CSF leakage	CSF leakage
9	UL	8	T1-T7	T9-T12	7	4	425	240	60.7	60	900	600	129	150	67	27	Acute epidural hematoma,wound infection	CSF leakage
10	LL	0.5	T8-L5	T3-T7	10	5	400	425	40	85	600	1000	60	200	40	_	CSF leakage, screw malposition	CSF leakage
11	LL	15	T10-L1	T3-T5	4	3	210	335	52.5	111.7	4000	2500	1000	833	8	14	N	N
Average	_	11.1	_	_	5.2	3.8	274	246	60.8	72.2	1200	1068	305.5	334	22.3	19.8	_	_
SD	_	12.6	_	_	2.6	1.6	103	81	32.8	29.9	1044	625	345.8	261	17.6	5.1	_	_
P value	_	_	_		0.154		0.488		0.407		0.723		0.831		0.371		_

ISSN: 1471-2474