The primary outcome measure will be the incidence of chronic post-sternotomy chest pain 6 months following CABG with median sternotomy. However, we will also measure the incidence of CPSP at 3 and 12 months to determine the trajectory. Secondary outcomes will include: Pain intensity (numeric rating scale-NRS) of chest pain (which differs from preoperative) at rest and while coughing daily while in hospital until discharge and at 1 week postoperatively. Analgesic consumption (morphine equivalents) daily while in hospital until discharge, 1 week post-operatively and then at 3, 6, and 12 months postoperatively. Intra-operative data will include forces on sternal edges during retraction (maximal and mean), time from initiation to full retraction, latency from full retraction to sternal closure, width of sternal opening at full retraction. Pain quality, quality of life, and pain interference with daily function at 3, 6 and 12 months post-operatively. All assessments following discharge from the hospital will be via telephone calls from a research nurse blinded to randomization assignment. In-hospital assessments will also be done by a research nurse blinded to group assignment.