A Post-Market, Retrospective Study on 3D Metal Tibial and Femoral Cones

Completed

Conditions studied: Total Knee Arthroplasty

In brief

GMK Revision Knee System is part of the Medacta GMK® (Global Medacta Knee) Total Knee System and is indicated when a higher level of varus/valgus constraint is needed. The external shape of the GMK® Revision femoral component is identical to that of GMK® Primary. The GMK® Revision differs from GMK® Primary by three important design features: i. The addition of a box which allows a stem to be inserted into the femoral canal; ii. The addition of screw lugs so that augments can be placed on the distal and posterior resections, and; iii. The box which also allows various levels of constraint to be added to the polyethylene insert. The tibial component offers the ability to place augments. Indications for Use: The GMK® Total Knee System is designed for cemented use in total knee arthroplasty if there is evidence of sufficient sound bone to seat and support the components. This knee replacement system is indicated in the following cases: * Severely painful and/or disabled joint as a result of arthritis, traumatic arthritis, rheumatoid arthritis or polyarthritis * Avascular necrosis of femoral condyle * Post traumatic loss of joint configuration * Primary implantation failure * Ligamentous Instability Tibial augments are to be attached to the tibial baseplate with both the fixing cylinders and bone cement. In case a semi-constrained liner is used, an extension stem must be implanted both on the tibial and on the femoral component. GMK® Revision femoral components are manufactured of Cobalt Chromium Molybdenum (CoCrMo) according to ISO 5832-4:1996, Implants for Surgery- Metallic materials - Part 4: Cobalt-Chromium-Molybdenum Casting Alloy, the same as the GMK® Primary femoral components. They have an asymmetric patellar groove (left and right) with different radii of curvature in coronal plane as well as non-parallel anterior and posterior cuts (wedge shape). The GMK® Revision posterior stabilized femoral components are designed for use without cruciate ligaments when additional stability is required to prevent subluxation of the femur to the tibia in flexion, same as the GMK® Primary femoral components. In case of severe bone loss, the tibial cones and femoral cones may be used to respectively reinforce the proximal tibia cavity and the distal femoral cavity, providing structural support and load redistribution on the remaining bone. Being an integral part of revision TKA for patients with such bone loss, the clinical outcomes for revision TKAs using the cone components are important for the knowledge regarding performance and survivorship of the Revision TKA as a whole.

Key facts

Study ID: NCT06578897
Run by: Medacta International SA
People needed: 118
Starts: 2024-02-13
Expected to finish: 2025-02-13
Last updated by the study team: 2025-09-29

Who can join

Age: any. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Subjects underwent revision total knee replacement for any type of etiology (Osteoarthritis, Avascular necrosis, Rheumatoid Arthritis, Post-traumatic Arthritis, Polyarthritis, Primary implantation failure, Infection, Ligamentous Instability)
Subjects must have received a Medacta GMK Revision component using 3D metal tibial and femoral cones
Must be at minimum 1 year (12 months) post-treatment
No age limit criteria

You may not qualify if…

Subjects with neuromuscular or neurosensory deficiency, which would limit the ability to assess the performance of the device
Subjects that were incarcerated at the time of surgery.
History of alcoholism
On chemotherapy or radiation therapy during the time of interest
Habitual use of narcotic pain medications prior to surgery or after surgery for reasons other than knee pain
History of a metabolic disorder affecting the skeletal system other than osteoarthritis or osteoporosis
History of chronic pain issues for reasons other than knee pain
Progressive local or systemic infection during time of interest
Muscular loss, neuromuscular disease, or vascular deficiency of the affected limb
Obesity or excessive weight of subject

Where it is running

Northwestern — Chicago, Illinois, United States

Full record on ClinicalTrials.gov

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