Foraminoplasty at the Tip or Base of the Superior Articular Process for Lateral Recess Stenosis in Percutaneous Endoscopic Lumbar Discectomy: A Multicenter, Retrospective, Controlled Study with 2-Year Follow-Up

Table 4

Changes of preoperative and postoperative ODI scores .

Time point	Pre-operation	1 months postoperatively	3 months postoperatively	6 months postoperatively	1 year postoperatively	2 years postoperatively
Group A	50.1±6.9	34.5±5.6	20.4±5.3	18.1±4.3	16.8±3.8	14.6±3.2
Group B	50.4±5.3	33.8±5.4	20.9±4.4	17.8±4.5	16.9±3.1	14.7±3.0

ODI:  Oswestry Disability Index.