This study will be a prospective randomized controlled trial evaluating the effectiveness of using Headspace before and after undergoing total knee replacement surgery. The purpose of this study will be to determine whether using Headspace will help to improve functional outcome scores, decrease pain, and decrease opioid medication use after total knee replacement in patients with depression and/or anxiety. Headspace is a smartphone-based application that guides individuals through various mindfulness sessions and has been shown to reduce symptoms of depression, anxiety, and pain.

Inclusion Criteria:

• Patients undergoing unilateral primary TKA

AND

• Patients with MDD who take medication for MDD and/or Patients with GAD who take medication for GAD
• Patients with MDD and/or Patients with GAD who are being treated for those conditions with psychotherapy by a psychologist or psychiatrist
• Patients with an SF-12 Mental Health Score less than 45.6
• Owning a smartphone (Apple or Android) to be able to download the mindfulness application

Exclusion Criteria:

• Patients undergoing bilateral TKA
• Patients undergoing revision TKA
• Patients with mental health conditions other than MDD and/or GAD
• Patients currently utilizing a mindfulness application