Although a standard knee is very good at improving pain and function, and most patients do very well

following surgery, there are some potential functional downsides.

Tennis Player

With the Conformis knee, the custom made replacement matches the asymmetrical shape of the knee and allows the angle of the joint to be placed back to normal, and at the same time allowing the weight to be evenly distributed across the implant. The Conformis knee also allows a very good fit to the cut surfaces of the bones, rather than a closest fit. It really is

the closest thing to a normal knee that is available, with good evidence of improved patient satisfaction compared to a standard knee replacement. 


Watch the short video below to learn more about customised knee replacements.

A standard ‘off the shelf’ total knee replacement forces us to make some compromises regarding the alignment of the knee joint. The two sides of the knee replacement when viewed from the front are symmetrical. 


This is not the case in the normal knee, and to accommodate this difference the cuts made to the bones alter the angle of the knee joint to allow the symmetrical implant to maintain stability throughout a full range of movement. These cuts also enable the surgeon to straighten the leg so that the weight is evenly distributed across the implant when walking.

Established in 2004, ConforMIS is a privately held medical device company based in Massachusetts.
Starting with the basic premise - make the implant fit the patient rather than force the patient to fit the implant.
By combining advanced 3D imaging technology with the latest manufacturing capabilities,
ConforMIS customise each and every implant to the patient’s unique size and shape.

Anatomy of the knee


To understand the benefits of the ConforMIS personalized approach, it’s important to understand the anatomy of your knee. Your knee joint is formed by the intersection of the femur (thigh bone), the tibia (shin bone) and patella (knee cap). These bones form three ‘compartments’ or sections.


Osteoarthritis (OA) is a degenerative joint disease characterized by the breakdown and wearing away of cartilage causing the bones to rub together and result in pain. It can aect all of the knee or just parts, depending on the severity.


A partial knee replacement (PKR) is an option for people who have OA in one or two compartments. A total knee replacement (TKR) is an option for people with OA in all three compartments.


Inner Half of your knee


Outer Half of your knee


Behind the knee cap


iUni G2
iDuo G2
iTotal G2

If you only have arthritic damage to one compartment of the knee, either the medial or lateral, a total knee replacement might not be your best option.


The iUni G2 unicompartmental knee implant preserves the parts of the knee not damaged by arthritis.




If your arthritic damage is limited to two of the three compartments of the knee, a total knee replacement might not be your best option.

The iDuo G2 bicompartmental knee implant preserves the parts of the knee not damaged by arthritis.

 Two of the leading causes of dissatisfaction after surgery are residual pain and functional limitations. I think both of these issues can be addressed by a better implant design.


iTotal CR is designed to achieve unique advantages as compared to of-the-shelf knee implants. 


If you are interested to learn more about the ConforMIS Knee Replacement Range, please feel free to
contact me for an informal chat and together we can decide on the best course of action. In the meantime, 
you may wish to visit the ConforMIS website, where you can watch testimonials from actual patients.

Cal Woods

iTotal - Left Knee​

Cal Woods - Age 56
Irene Passani
Irene Passani - Age 52

iUni - Right Knee

John Lynch
John Lynch - Age 64

iTotal - Right & Left Knee

You may also wish to consider…


Mr Jeremy Jarratt is an accredited Mako Robotic Surgeon. There is only one Mako robot in Manchester, and only a select few hip and knee surgeons are accredited and trained to use this system.


Mako is a robotic-arm assisted technology that helps surgeons provide patients with a truly personalised surgical experience. The Mako robot allows us to place the knee replacement on a 3D model of the patients own anatomy, constructed from a CT scan.

Mako Robotic Surgeon