Inclusion Criteria:  ≥18 years old at time of treatment  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:  10 degrees of overall cervical kyphosis (measured from C2-C7) 10 degrees of kyphosis across any 1 or 2 cervical segments 10 degrees of scoliosis C2-C7 SVA >4cm Plan for surgical correction of cervical deformity in the next 6 months Willing to provide consent and complete study forms at baseline and follow-up intervals  Exclusion Criteria:  Active spine tumor or infection Deformity due to acute trauma Unwilling to provide consent or to complete study forms Prisoner Pregnant or immediate plans to get pregnant