Total-hip replacement, also referred to as total-hip arthroplasty, is a surgical procedure in which the ball and socket of the hip joint are replaced by implants as shown in the images below:
- A metal cup with a plastic liner replaces the socket in the pelvis
- A metal or ceramic head attached to a metal stem implanted in the femur replaces the ball
The new femoral head and cup liner provide a smooth bearing surface allowing the joint to move smoothly. The cup and stem are implanted in the bone and have a surface that allows the bone to grow into the implant for permanent fixation.
Why do some hip replacements fail?
Implants are subject to mechanical failure under certain conditions with the most common being loosening which can be caused by wear of the plastic liner. Implant placement at time of surgery is critical to avoid accelerated plastic wear. Other potential complications include infection, joint instability or dislocation, fracture of the bones holding the implants and differences in the length of the legs.
The MAKO Robotic Arm Interactive Orthopaedic System’s Increased Accuracy
Produces Clinically Proven Better Results
If your surgeon determines that you are a good candidate for MAKOplasty, the process begins with a CT scan of your hip prior to surgery (see image below). The RIO® system creates a virtual model of your hip from the CT scan and a patient-specific plan is created for optimal size and placement.
The surgical procedure begins with a registration process where the RIO system physically tracks the hip’s position and matches it with a virtual model on its computer. A tracker with arrays is placed on the top of your hip and collects constant real-time information on you hip’s physical location and passes it to the system via a high-definition camera. The RIO system provides visualization and measurements that help your surgeon optimize implant positioning and alignment and allow fine tuning of the surgical plan. Once the plan is finalized, a safety zone is established for the use of the surgeon-controlled robotic arm.
Robotic-arm assisted surgery
The surgeon uses the robotic arm to prepare and shape the pelvic bone in the acetabular socket for the metal cup implant in a process called reaming. As the surgeon leads this process, the RIO system provides the surgeon visual, auditory and tactile feedback to enforce the safety zone established in the surgical plan for optimal bone preparation. When bone preparation is complete, the cup is implanted using the robotic arm to assure placement is accurate in terms of depth and orientation. The plastic liner is then locked into the metal cup.
The next step is the femoral bone preparation. The RIO system enables guided femoral neck resection and femoral bone preparation, providing the surgeon with real-time data on positioning and hip length. Once the bone preparation is complete, the femoral stem is implanted in the thigh bone, and the femoral head is attached to the stem to reconstruct leg length and soft tissue tension. The femoral head is placed in the cup and the RIO system provides the surgeon all the information needed to confirm the operation was completed as planned.
The Benefits of MAKOplasty
MAKOplasty enables a new level of accuracy that is unattainable with conventional hip replacement procedures which results in enhanced stability and increased range of motion for the patient.
Accurate placement and alignment of implant components are critical for a successful hip replacement. Published studies show even an experienced surgeon can be off by more than just a few degrees in judging the cup and stem implant positions using conventional techniques. Early clinical data suggests that MAKOplasty demonstrates 4-6 times greater accuracy in cup implant placement than manual techniques in laboratory settings, reducing chances for complications such as impingement (rubbing together), implant wear and dislocation.
The MAKOplasty robotic-arm assisted total-hip replacement procedure is now being performed at Reconstructive Orthopedics & Sports Medicine by Dr. Kevin Shaw, Dr. Michael Swank and Dr. Josh Murphy. Ask your doctor if you might benefit from this new technology.
MAKOplasty® Robotic Arm Assisted Total Hip Replacement
Your Pre-operative Guide
MAKO™ Robotic-Arm Assisted Surgery for Total-hip Replacement
A Patient’s Guide