Dr. Justin Chang

Mako SmartRobotics™

Partial knee replacement with the Mako robot.

When arthritis is limited to one compartment of the knee, replacing only that compartment preserves the ACL, healthy cartilage, and the natural feel of the joint. Dr. Chang performs partial knee replacement with Stryker’s Mako SmartRobotics™ system — the platform behind MAKOplasty — pairing a CT-based 3D surgical plan with robotic-arm precision.

CT-based 3D plan

A pre-operative CT scan builds a personalized 3D model of your knee, so implant size and position are planned before the first incision.

Robotic-arm precision

The robotic arm keeps bone preparation within the planned boundaries, protecting the ACL and the healthy compartments of the knee.

Balanced in real time

Intra-operative data lets Dr. Chang fine-tune ligament balance and implant position to your anatomy during surgery.

Muscle-sparing approach

For medial partial knees, Dr. Chang uses a subvastus approach that works beneath the quadriceps muscle and leaves the tendon intact.

Mako™ SmartRobotics robotic-arm assisted surgery system used by Dr. Justin Chang

Roughly 30% of patients who need a knee replacement are candidates for a partial. Compared with total knee replacement, a partial typically means a smaller incision, faster recovery, and a knee that feels closer to your own — most patients go home the same day and walk within hours of surgery.

Dr. Chang’s fellowship at University College London Hospitals focused specifically on robotic hip and knee arthroplasty, and his published research examines the outcomes of robotic joint replacement. As a Stryker consultant, he teaches the Mako technique to other surgeons.

Your consultation starts with imaging review: Dr. Chang confirms whether your arthritis is limited to one compartment and whether a partial knee, a total knee, or another option fits your case best.

Learn about partial knee replacement

2 fellowships

Robotic arthroplasty (London) · sports medicine (Toronto)

~30%

Of knee replacement candidates suit a partial knee

Day surgery

Most Mako partial knee patients go home the same day

2026

Toronto’s Top Doctors — Post City Magazine

Credentials

Training and credentials.

Education and training

Fellowship

Robotic Hip & Knee Arthroplasty

University College London Hospitals, under Professor Fares Haddad

Fellowship

Sports Medicine & Arthroscopy

University of Toronto

Residency

Orthopaedic Surgery — Chief Resident

University of Toronto

Medical degree

Bachelor of Medicine, Bachelor of Surgery (MBBS)

St. George’s, University of London

Certifications and positions

Royal College of Physicians and Surgeons of Canada

FRCSC — Orthopaedic Surgery

Royal College of Surgeons of England

MRCS

Positions

Humber River Health, Toronto

Orthopaedic surgeon — lower extremity arthroplasty & sports medicine

Clinical Lecturer

University of Toronto, Division of Orthopaedic Surgery

Stryker Consultant

Trains surgeons on the Mako SmartRobotics™ system for robotic joint replacement

Research and recognition

Robotic Joint Replacement Research

Peer-reviewed publications and textbook chapters on robotic outcomes and technology in orthopaedic surgery

Toronto’s Top Doctors 2026

Post City Magazine

Procedures

Procedures performed.

Dr. Chang’s practice centres on Mako robotic knee replacement — partial and total — alongside direct anterior hip replacement and complex knee revision.