Usefulness of Fat Suppression Magnetic Resonance Imaging of Osteoporotic Vertebral Fractures in Preventing Subsequent Fractures After Kyphoplasty

BACKGROUND:Preoperative magnetic resonance imaging with fat suppression (FS-MRI) is useful to detect bone marrow edema in osteoporotic vertebral fractures (OVFs) and thus can improve diagnostic accuracy and influence surgical strategy for percutaneous augmentation. The role of preoperative FS-MRI in preventing subsequent fractures after balloon kyphoplasty has not been investigated in initially subclinical fractures or fractures without obvious morphologic changes. METHODS:From January 2010 to December 2017, 214 consecutive patients underwent balloon kyphoplasty for painful OVFs. We defined 2 groups based on preoperative imaging (100 patients had preoperative FS-MRI and 114 patients had no MRI) and then compared baseline and surgical characteristics. The primary end point was incidence of subsequent fractures within 12 months after treatment. RESULTS:The 214 patients underwent kyphoplasty of 414 vertebrae. Comparing FS-MRI with no-MRI groups, spontaneous fractures occurred significantly more (58% vs. 26.3%; P < 0.001) and fractures were more often multilevel (≥ 4 levels) (15% vs. 2.6%; P = 0.001), respectively. Overall incidence of subsequent vertebral fractures was 25.7% (32% in FS-MRI, 20.2% in no-MRI groups; P = 0.048). Average time to diagnosis of subsequent fractures did not differ between the 2 groups (9.3 FS-MRI vs. 11.5 weeks no-MRI; P = 0.411). Age ≥80 years at the time of balloon kyphoplasty was associated with a higher odds ratio (2.3) for subsequent fractures within 12 months (P = 0.039). CONCLUSIONS:Surgical treatment according to preoperative FS-MRI did not reduce occurrence of subsequent OVFs and did not prolong fracture-free intervals within 12 months after kyphoplasty.