229. A call to “Own the Bone”: osteoporosis is a predictor for two-year outcomes after adult spinal deformity surgery

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BACKGROUND CONTEXT Osteoporosis (OP) is a common condition affecting nearly 200 million individuals globally. Similarly, adult spinal deformity has a peak prevalence of 65% of the adult population. While bone health is instrumental in orthopaedic surgery, few studies have described the long-term outcomes of osteoporosis following surgery for ASD. PURPOSE We sought to evaluate the impact of OP on two-year postoperative complication rates when compared to patients without OP. STUDY DESIGN/SETTING Retrospective cohort study. PATIENT SAMPLE Utilizing the New York State Statewide Planning and Research Cooperative System (SPARCS), we identified all patients who underwent ≥4-level fusion with ICD-9 codes diagnostic for ASD (progressive idiopathic scoliosis and degenerative lumbar disease) from 2009-2011 with ≥2-year follow-up. Patients with osteoporosis (OP) and without OR were identified following exclusions. OUTCOME MEASURES Patient demographics, hospital-related parameters, postoperative complications and reoperations. METHODS Using SPARCS, we identified all patients who underwent ≥4-level fusion with ICD-9 codes diagnostic for ASD (progressive idiopathic scoliosis and degenerative lumbar disease) from 2009-2011 for ≥2-year minimum follow-up. Patients with osteoporosis (OP) and without OP were identified. Any patients with bone mineralization disorders (osteomalacia, rickets, hyperparathyroidism [primary, secondary, tertiary], vitamin D deficiency) and other systemic (fibrous dysplasia, sickle cell disease, renal osteodystrophy) and endocrine disorders (thyroid hypo- or hyperfunctioning disorders, adrenal insufficiency, adrenal hyperplastic syndromes) affecting bone quality or production were excluded, as were patients with surgical indications of trauma, systemic disease, infection, or cancer. The two cohorts were compared for demographics, hospital-related parameters, and 2-year postoperative complications and reoperations. Multivariate binary stepwise logistic regressions was utilized to identify significant predictors of these outcomes (covariates: OP, age, sex, race, and Charlson/Deyo). RESULTS A total of 6,132 patients were identified (OP, n=490 (7.99%); No-OP, n=5,642). OP patients were older (67.6 vs 56.7 years), more often female (83.7% vs 46.2%) and white (84.3% vs 79.1%), and had higher comorbidity scores (Charlson/Deyo: 0.72 vs 0.61), all p CONCLUSIONS Osteoporosis was associated with two-year postoperative complications in ASD patients. Aside from being an etiology of ASD due to vertebral fracture, osteoporosis should be considered as a comorbidity that needs to be optimized and managed perioperatively. Furthermore, this data is a call to every spine surgeon to consider metabolic bone disorders screening prior to any spinal deformity surgery. FDA DEVICE/DRUG STATUS This abstract does not discuss or include any applicable devices or drugs.