Complex Adult Deformity Surgery (CADS)

This registry study collects detailed clinical data on adults having complex spinal deformity surgery — procedures to correct severe curvature or malalignment of the spine that significantly affects posture and quality of life. These surgeries are among the most complex in orthopedics, often involving long fusion constructs and osteotomies (bone cuts). The registry aims to identify factors that predict outcomes and complications to improve surgical decision-making. Participants have a preoperative evaluation including full-body imaging and are followed up after surgery. There is no experimental intervention — it is a data collection study to better understand outcomes from complex spinal surgery. You may be eligible if... - You are 18 years or older - You have been diagnosed with adult spinal deformity (congenital, degenerative, idiopathic, or iatrogenic) - Your deformity meets specific radiographic or procedural criteria for complexity (e.g., large curves, multiple levels of fusion, or corrective bone cuts) - You have had a full-body EOS X-ray evaluation You may NOT be eligible if... - You are under 18 years of age - You have an active spinal tumor or infection - Your deformity is caused by acute trauma - You have a neuromuscular disease (e.g., Parkinson's, multiple sclerosis) - You are pregnant - You are a prisoner or non-English speaker Talk to your doctor to see if this trial is right for you.