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Study Design.

A retrospective review of 281 consecutive cases of adult spine deformity (ASD) surgery (age 55±19 yrs, 91% female, follow-up 4.3±1.9 yrs) from a multicenter database.

Objective.

To compare the value and predictive ability of the 5-item modified frailty index (mFI-5) to the conventional 11-item modified frailty index (mFI-11) for severe adverse events (SAEs).

Summary of Background Data.

Several recent studies have described associations between frailty and surgical complications. However, the predictive power and usefulness of the mFI-5 have not been proven.

Methods.

SAEs were defined as: Clavien-Dindo grade> 3, reoperation required, deterioration of motor function at discharge, or new motor deficit within 2 years. The patients’ frailty was categorized by the mFI-5 and mFI-11 (robust, prefrail, or frail). Spearman's rho was used to assess correlation between the mFI-5 and mFI-11. Univariate and …