Table 4.

Comparison of correction of oblique lateral interbody fusion alone with different bony procedures

Factors	Preoperative values (°)	Postoperative values (°)	Correction amount (°)
Correction amount of OLIF only with posterior instrumentation (7 cases)	17.9±13.2	30.3±10.6	12.4±10.9 (P=0.01, power=0.74)
Correction amount of OLIF and facetectomy or ALL resection over OLIF site (5 cases)	11.8±6.2	39.8±3.6	28.0±4.8 (P=0.043, power=0.99)
Correction amount of OLIF and bony resection procedures (3 cases)	12.0±16.5	25.7±9.7	13.3±11.1

P<0.05 was considered statistically significant. Powers of all significant P values were analyzed and if the power is more than 0.8, it is considered to be valuable. Bony resection procedures include pedicle subtraction osteotomy, Smith-Peterson osteotomy, and multiple crack osteotomy. OLIF=Obloquie lumbar interbody fusion, ALL=Anterior longitudinal ligament