Article Figures & Data
Figures
- Fig. 1
MIS TLIF Subgroup: Improvement in Walking and Employment Disability. A significant improvement in walking ability (analyzed from ODI question #4) and employment tolerance (analyzed from ODI question #8) was observed starting at the 6 week post-operative assessment.
- Fig. 2
MIS TLIF Subgroup Oswesty Disability Index Outcome Segmented by Pre-operative Disability. All subgroups were observed to have a significant improvement in Oswestry Disability Index scores at the 1 year post-operative assessment. However, the post-operative time needed to attain initial significant improvement in ODI was different for every subgroup. Patients with high pre-operative disability (>50) reported a significant improvement starting at the 6 week post-op time point. Patients with a lower pre-operative disability index score (< 50) reached significant improvement in ODI score starting 3 months post-op.
- Fig. 3A and 3B
Survey Question Completion Rate. Individual question response rate was performed for each of the questions asked to patients (1A) and to the operating surgeon (1B) over a 2 year study period. A response rate less than 50% was observed for 78 patient-directed questions and 24 surgeon-directed questions.
- Fig. 4
Algorithm detailing correspondence method used to obtain missing 1 year post-operative follow-up information. Email based surveys were sent to the remaining patients with missing information without any additional form acquisition.
Tables
n Total enrolled patients 478 Procedure MIS Hemilaminectomy 118 MIS TLIF 98 Transforaminal Endoscopic Foraminotomy & Discectomy 86 MIS ALIF 40 MIS Microdiscectomy 31 MIS Lateral Lumbar Interbody Fusion 22 MIS ACDF 18 Other 65 Preoperative 1 Year Postoperative Paired t-test (p) ODI 47.1 ± 16.9 (n = 98) 28.8 ± 21.2 (n = 84) 0.001 VAS Back 6.5 ± 2.6 (n = 98) 3.2 ± 2.7 (n = 84) 0.001 VAS Affected Leg 5.3 ± 2.8 (n = 98) 1.7 ± 2.6 (n = 84) 0.001 Preoperative 6 Months Postoperative Paired t-test (p) SF-12 MCS 42.0 ± 15.5 (n = 282) 48.2 ± 17.4 (n = 77) 0.05 SF-12 PCS 28.2 ± 9.8 (n = 282) 37.0 ± 15.3 (n = 77) 0.001 - Table 3
MIS TLIF Subgroup Demographic Data. All surgical indications for MIS TLIF are included in the MIS Registry on a level-by level basis.
n Total MIS TLIF Patients 98 Median Age at Surgery 64.5 Diagnosis Spondylolisthesis 26 Central Stenosis 26 Foraminal Stenosis 14 Post-laminectomy Syndrome Degenerative Scoliosis 14 6 Procedure 14 6 1-Level 64 2-Level 23 3-Level 3 TLIF + LLIF Procedure 3 Preoperative 1 Year Postoperative Paired t-test (p) ODI 46.5 ± 15.2(n = 45) 26.2 ± 20.4 (n = 40) 0.0001 VAS Back 6.5 ± 15.5 (n = 45) 3.2 ± 2.5 (n = 40) 0.0001 VAS Affected Leg 5.4 ± 2.8 (n = 45) 1.7 ± 2.8 (n = 40) 0.0001 Preoperative 6 Months Postoperative Paired t-test (p) SF-12 MCS 41.3 ± 15.8 (n = 87) 50.5 ± 12.7 (n = 34) 0.05 SF-12 PCS 26.6 ± 10.7 (n = 87) 39.9 ± 15.3 (n = 34) 0.001
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