Observational Study of Depression in Patients Undergoing Cervical Disc Arthroplasty: Evidence of a Correlation between Pain Relief and Resolution of Depression

Preoperative and 12-month scores of Depressed and Non-Depressed patients for NDI, PCS, MCS, neck pain, and arm pain. NDI: neck disability index (lower scores indicate improvement); PCS: physical component summary of the SF-36; MCS: mental component summary of the SF-36 (higher scores indicate improvement).