The opinions expressed in this video represent the experiences of those interviewed and not the opinions of ConforMIS.

Patient-Specific Knee Implants

There is a reason 1 in 5 patients are not satisfied with their traditional total knee replacement.1

In a traditional knee replacement, the surgeon selects an “off-the-shelf” implant from a range of standard fixed sizes, and then has to make the necessary adjustments to fit the implant to the patient during the procedure.

Because off-the-shelf knee replacements are not designed to your specific anatomy, surgeons have to compromise on implant fit. This compromise may result in having implant overhang (implant hangs over the bone) or underhang (the implant is too small, leaving the bone exposed and uncovered). It could also result in an implant that is not aligned properly.

Clinical studies have demonstrated that these compromises on fit can be the leading causes of residual pain after surgery. At ConforMIS we design implants to fit the patient, not the other way round. We combine proven elements of standard knee replacement with our iFit® Image-to-Implant® technology to create patient-specific knee implants and surgical instrumentation that are designed to fit your knee’s natural shape and curves.

With this patient-specific approach, the ConforMIS knee replacement systems offer unique advantages we believe are not possible with traditional, off-the-shelf implants, including:

  • Individual fit that reduces sizing compromises common with off-the-shelf implants and associated with residual pain after surgery2
  • Designed to follow the shape and contour of each patient’s knee, which provides an increased potential for a more natural feeling knee
  • Designed for optimal bone preservation3
  • Reproducible surgical technique using disposable pre-navigated iJig® instrumentation and iView surgical planning images that can be used to verify accuracy throughout the surgery

The iTotal CR Knee Replacement System is intended for use as a total knee replacement in patients with knee joint pain and disability whose conditions cannot be solely addressed by the use of a prosthetic device that treats only one or two of the three knee compartments, such as a unicondylar, patellofemoral or bicompartmental prosthesis. Only a licensed doctor can help you determine the appropriate medical treatment. There are potential risks to knee replacement surgery, and individual results may vary. Before making any decisions concerning medical treatment, consult your doctor regarding your options and the risks of those options. The longevity, performance and feel of any knee implant will depend on various factors, including your physical condition, your activity level, adherence to your doctor's instructions, and other factors.

The Indications for Use include:

  • Painful joint disease due to osteoarthritis, traumatic arthritis, rheumatoid arthritis or osteonecrosis of the knee.
  • Post traumatic loss of joint function.
  • Moderate varus, valgus or flexion deformity in which the ligamentous structures can be returned to adequate function and stability.
  • Failed osteotomies, hemiarthroplasties, and unicondylar, patellofemoral or bicompartmental implants.
  • Revision procedures provided that anatomic landmarks necessary for alignment and positioning of the implant are identifiable on patient imaging scans.
The implant is intended for cemented use only. Caution: United States of America Federal law restricts this device to sale by or on the order of a doctor.

1: According to a study of 1,703 patients published by Bourne in 2009 in the peer-reviewed journal Clinical Orthopaedics and Related Research (In this study entitled Patient Satisfaction after Total Knee Arthroplasty: Who is Satisfied and Who is Not?, “the overall satisfaction question was used to determine a two category satisfaction outcome by combining patients who answered very dissatisfied, dissatisfied, or netural into one group, and patients who answered satisfied or very satisfied into the second group.”)

2: Mahoney, et al; Overhang of the Femoral Component in Total Knee Arthroplasty: Risk Factors and Clinical Consequences.The Journal of Bone and Joint Surgery; 2010, 92: 1115-1121

3: In a study by W. Kurtz titled “Patient-Specific Knee Replacement Implants Preserve Bone and Decrease Blood Loss & Swelling” presented at the 2013 BASK Annual Meeting, comparing 66 iTotal patients with 66 patients receiving one off-the-shelf implant brand (Zimmer NexGen), thickness of the femoral (distal and posterior medial/lateral), and tibial (medial/lateral) resections were measured intra-operatively. The average total of all bone resection measurements for iTotal was 27% (14mm) less than for the off-the-shelf total knee. Additionally, the total thickness of the iTotal implants was 25% (15.7mm) thinner on average than the off-the-shelf implants.