Frailty and Health-Related Quality of Life Improvement Following Adult Spinal Deformity Surgery

BACKGROUND: Although the Adult Spinal Deformity Frailty Index (ASD-FI) predicts major complications and prolonged hospital length of stay after adult spinal deformity surgery, the impact of frailty on postoperative changes in health-related quality of life (HRQoL) is unknown. METHODS: Patients who underwent instrumented fusion of >= 4 levels for adult spinal deformity with minimum 2-year follow-up were stratified by Adult Spinal Deformity Frailty Index score into 3 groups: nonfrail, frail, and severely frail. Baseline and follow-up demographics, HRQol. measures, and radiographic parameters were analyzed. Primary outcome measures included proportion of patients who achieved substantial clinical benefit (SCB) in terms of Oswestry Disability Index, 36-Rem Short Form Health Survey Physical Component Summary, and numeric hack and leg pain scores. RESULTS: Inclusion criteria were met by 332 patients (135 nonfrail, 175 frail, 22 severely frail). Frail and severely frail patients were older and had more comorhidities, worse baseline HROol. and pain scores, and worse radiographic deformity than nonfrail patients (P < 0.05). At 2-year follow-up, all outcome scores were worse in frail and severely frail patients compared with nonfrail patients. Frail patients improved more than nonfrail patients and were more likely to reach SCB for Oswestry Disability Index (43.7% vs. 29.3%; P = 0.025), 36-Item Short Form Health Survey Physical Component Summary (56.9% vs. 51.2%; P = 0.03), and leg pain (45.8% vs. 23.0%; P = 0.03) scores, but not back pain (57.5% vs. 63.4%; P = 0.045) score. CONCLUSIONS: Despite higher risk stratification and worse baseline HRQoL, frail patients were more likely to reach SCB for most HRQoL measures compared with nonfrail patients. Severely frail patients were the least likely to reach SCB for most HRQoL measures.