Savile Row Unicondylar Knee

The Savile Row Unicondylar Knee implant is designed to be used as part of an integrated surgical solution for the treatment of osteoarthritis of the medial compartment of the knee. This personalised 'Savile Row' approach comprises patient specific implants, designed from a pre-operative CT scan, coupled with robotically assisted surgical implantation using the Stanmore Sculptor RGA (Robotic Guidance Arm) robot and associated instrumentation.

The Savile Row Unicondylar Knee (Series I) is a medial unicompartmental knee replacement system consisting of a femoral component, a tibial component and a mobile meniscal bearing.

Tibia

The cemented tibial component, manufactured from cobalt chrome, features a curved side wall. This patent protected curvature is designed to reduce the risk of tibial fracture. Traditional implant designs have a sharp corner where the sagittal cut meets the flat cut and this creates a stress raiser, even with very careful preparation there is the ever present threat of over cutting on either plane with the saw. This coupled with over impaction can lead to intra-operative and postoperative tibial fractures.

The tibial component's orientation and position within the bone is determined on CT bone models in Stanmore's proprietary Planner software. Input from the surgeon can be sought at this stage and once the implant's orientation and position have been defined, the profile of the implant is adjusted to perfectly match the patient's cortical bone. This provides patient specific optimised bone coverage and evenly distributes load through the hard cortical bone of the tibia. This patient specific implant model can now be viewed in the planned position within the bone model in the Planner software and the final design and position is agreed with by the surgeon prior to implant manufacture.

Femur

The cemented femoral component, manufactured from cobalt chrome, consists of a number of blended radii, ensuring maximum congruency with the meniscal bearing during the loading phase of the gait cycle and the patient specific extension radii match the patient's existing anatomy ensuring that only minimal healthy bone and cartilage needs to be removed.

As with the tibial component the position and optimal fit of the femoral component curvature determined on CT bone models in Stanmore's proprietary Planner software as necessary sections of the implant now can be trimmed to ensure that there is no implant overhang that will interfere with soft tissue. This can particularly be an issue around the anterior edge of the component. Again the final design, orientation and position are agreed with the surgeon prior to implant manufacture.

Bearings

The Savile Row implant incorporates a range of sliding meniscal polyethylene bearings. These bearings are designed to match the extension radius of the femoral component so that the bearing achieves maximum congruency with the femur through the loading phase of gait. The polyethylene bearings are supplied in a range of thicknesses to provide intra-operative options and allow correct soft tissue balancing.

Savile Row and Savile Row Precision Orthopaedics are trademarks of Stanmore Implants Worldwide Ltd