Operative

Inclusion Criteria:~1. ≥18 years old at time of treatment~2. Patient undergoing a posterior cervical instrumented fusion using the DePuy Synthes SymphonyTM OCT System for the treatment of adult cervical deformity, defined as any of below criteria:~ 1. Loss of cervical lordosis (≤ 0° cervical lordosis C2-7)~ 2. ≥ 5° of kyphosis across any 1 or 2 cervical segments~ 3. ≥ 10° of cervical scoliosis~ 4. C2-C7 SVA ≥ 4cm~ 5. T1 Slope minus Cervical Lordosis ≥ 20°~ 6. Grade I or greater Spondylolisthesis at any segment C1-T1~ 7. Horizontal Gaze ≤ 0 or ≥ 11~3. Plan for surgical correction of cervical deformity in the next 6 months~4. Willing to provide consent and complete study forms at baseline and follow-up intervals~Exclusion Criteria:~1. Active spine tumor or infection~2. Deformity due to acute trauma~3. Unwilling to provide consent or to complete study forms~4. Prisoner~5. Pregnant or immediate plans to get pregnant