Patient-specific statistical shape modeling for optimal spinal sagittal alignment in lumbar spinal fusion

Abstract Purpose The present study compared patients developing ASD after L4/5 spinal fusion with a control group using patient-specific statistical shape model (SSM) to find alignment-differences between the groups. Methods This included who had undergone at and either remained asymptomatic (control group; n = 25, follow-up of > 4 years) or required revision surgery for epifusional ( 22). Landmarks on preoperative postoperative lateral radiographs were annotated, optimal sagittal alignment was calculated each patient. two-dimensional distance from SSM-calculated optimum actual positions before compared. Results Postoperatively, additive mean 86.8 mm in 67.7 p 0.119). Greater differences observed groups larger ideal more cranial levels. Significant difference seen postoperatively vertical operated segment L4. (5.69 ± 3.0 mm) significant greater SSM as (3.58 3.5 mm, 0.034). Conclusion Patients requiring lumbar have an by modeling. Further research might help understand value SSM, conjunction already established indexes, planning aim reducing risk ASD. Level evidence I Diagnostic: individual cross-sectional studies consistently applied reference standard blinding