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TRANSFORAMINAL VERSUS ANTERIOR LUMBAR INTERBODY FUSION AT L5-S1 IN OF ASD: EFFECT ON SPINOPELVIC PARAMETERS AND OUTCOMES IN DEGENERATIVE SCOLIOSIS
Eric S. Varley, Gregory M. Mundis Jr., Paul Park, David Okonkwo, Praveen Mummaneni, Adam Kanter, Richard Fessler, Dean Chou, Neel Anand, Juan Uribe, Robert Eastlack, ISSG
Nuvasive Royalties, consulting
K2M Royalties, consulting
DePuy Synthes Speaking engagement
Allosource Consulting
Global Spine Outreach Board of directors
San Diego Spine Foundation Board of Directors
DISCLOSURES
INTRODUCTION
Americans >65 years old is INCREASING
12.5 Mill (1990) 47.7 Mill (2015) 91.5 Mill (2060)
Prevalence Adult Scoliosis in General Population ranges 32%‐68%
EPIDEMIOLOGY
C.P. Ames. Spine Deformity 4 (2016) 310e322
EPIDEMIOLOGY
C.P. Ames. Spine Deformity 4 (2016) 310e322
Surgical treatment of ASD presents challenges
Sagittal balance, fusion, and optimize PROS
Lumbrosacral Junction
↑ pseudoarthrosis rate long ASD constructs
2 approaches: ↑ fusion rates + ↑ PROS
ALIF ‐ anterior lumbar interbody fusion
TLIF ‐ transforaminal lumbar interbody fusion
Unique advantages & disadvantages
Lack of evidence comparing 2 techniques
INTRODUCTION
To compare operative, radiographic & PROS outcomes of a cohort of patients undergoing either TLIF or ALIF at L5‐S1 for treatment of ASD with long segment fusions.
PURPOSE
Retrospective review of multicenter ASD database ASD patients treated with pedicle screw constructs with either ALIF
or TLIF at lumbrosacral junction 11 experienced surgeons with minimum 2 year follow up
Patient data collected Complications (major vs minor) Radiographic spinopelvic parameters (SVA, LL, PI, PI‐LL mismatch) Clinical Outcomes (VAS, ODI, SRS‐22)
Stats: 2 way ANOVAs (continuous) Fischer’s Exact test (categorical)
STUDY DESIGN/METHODS
ASD: 223 pa ents → 82 patients with ALIF or TLIF at LS junction ALIF (n=30) / TLIF
(n=52)
Similar patient demographics AGE: ALIF 61.1 ±
11.0 yrs vs TLIF 62.2 ± 8.9 yrs
GENDER: ALIF 53.% vs TLIF 73.1% Female
RESULTS
RESULTS
IMPLANT RELATED: ALIF: 1 patient had rod fracture and screw loosening
Resulting in 1 Re‐operation
TLIF: 3 rod frxs, 8 interbody migration, 1 subsidence, 3 screw breakage, 1 screw malposition Resulting in 11 Re‐operations
INFECTION: ALIF: No infections
TLIF: 8 surgical site infections
RESULTS
ALIF & TLIF: similar improvement in sagittal parameters, comparable EBL, Op Time, & HRQL outcomes
TLIF had higher rate of surgical site infec on with ↑ rate of implant related complica ons resul ng in ↑ rate of re‐operation
Future research targeted at severe spinopelvic imbalance
CONCLUSION