Table 2.

Distribution of Frail Patients Using mFI Scale, Pre-and Postoperative ODI, and Indication for Revisions Surgery.

Average preoperative ODI	44.9% (8–78%)
Average final ODI	34.2% (0–74%)
mFI-11
Frail	41 (17%)
Partially frail	141 (60%)
Not frail	33 (14%)
mFI-5
Frail	104 (44%)
Partially frail	75 (32%)
Not frail	36 (15%)
Revision surgery	82 (35%)
Hardware failure/pseudoarthrosis	41 (17%)
PJK	20 (8.5%)
Infection	10 (4%)
Chronic pain	6 (2%)
Adjacent segment disease	3 (1%)

Abbreviations: Oswestry Disability Index (ODI), modified frailty index (mFI), proximal junctional kyphosis (PJK).