Lateral interbody release for fused vertebrae via transpsoas approach in adult spinal deformity surgery: a preliminary report of radiographic and clinical outcomes

Table 2 Clinical outcomes associated with intervertebral levels treated with LIR

Case	Treated levels with LIR	Preoperative fusion ratio of fused vertebrae (a/b in Fig. 2)	Time to treat fused vertebrae (min)	Lordotic angles of XLIF cage (A)	Segmental lordotic angles 1-year after surgery (B)	(B)/(A)*100 (%)	Intraoperative endplate injury	Cage subsidence according to Marchi classification²²	Bone union pattern according to Proietti classification¹⁷ 1-year after surgery
1	L4/5	52.2	–	10	8	80	+	I	VI
2	L4/5	37.0	–	15	15	100	–	I	VI
3	L4/5	48.2	–	10	9	90	–	I	II
4	L3/4	17.2	20	10	16	160	–	0	IV
5	L2/3	75.6	20	15	14	93	–	0	VI
6	L4/5	91.5	36	15	16	107	–	0	VI
7	L1/2	78.9	14	10	9	90	–	II	VI
8	L3/4	18.3	11	15	10	67	–	0	IV
8	L4/5	35.0	13	15	12	80	–	0	IV
9	L3/4	100.0	20	15	19	127	–	II	VI
10	L3/4	52.5	–	15	11	73	–	I	II
11	L2/3	61.4	28	15	17	113	–	I	III
11	L3/4	69.5	16	15	14	93	–	0	VI
12	L3/4	88.7	36	15	17	113	+	III	V
12	L4/5	51.6	17	15	11	73	–	0	IV
13	L3/4	79.7	45	15	14	93	–	0	IV
14	L2/3	30.9	14	15	8	53	+	I	IV
15	L2/3	58.5	17	15	19	127	–	0	III
16	L2/3	57.9	25	10	12	120	–	I	III
17	L1/2	70.0	17	10	6	60	+	I	VI
17	L2/3	53.2	13	10	8	80	–	0	VI