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Original iteration of the MISDEF algorithm. LL, lumbar lordosis; N, no; PI, pelvic incidence; PT, pelvic tilt; SVA, sagittal vertical axis; Y, yes. (From Choy W, Miller CA, Chan AK, Fu KM, Park P, Mummaneni P V. Evolution of the Minimally Invasive Spinal Deformity Surgery Algorithm: An Evidence-Based Approach to Surgical Strategies for Deformity Correction. Neurosurg Clin N Am 2018;29:399–406; with permission)
