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The ACTIFY™ Unicondylar Knee System is indicated for unicompartmental knee replacement due to the following conditions: 1. Moderately disabling joint disease of the knee resulting from painful osteo- and/or post-traumatic arthritis, or avascular necrosis. 2. Revision of previous unsuccessful unicompartmental knee replacement or other procedure. 3. Alternative to tibial osteotomy in patients with unicompartmental osteoarthritis. 4. Previous tibial condyle or plateau fractures with loss of anatomy or function. 5. Varus or valgus deformities. These devices are indicated for cemented use only.

The ACTIFY™ Unicondylar Knee System implants consist of femoral and tibial implants that are used as part of a unicompartmental knee system for partial knee arthroplasty. Implants are available in various configurations and sizes to fit a wide variety of patient anatomy. ACTIFY Unicondylar femoral implants are manufactured from cobalt chrome alloy, tibial inserts are manufactured from ultra high molecular weight polyethylene (UHMWPE) with and without Vitamin E, and tibia trays are manufactured from titanium alloy.

Unicompartmental knee implants are indicated for restoring either compartment of a knee that has been affected by the following: · Noninflammatory degenerative joint disease including osteoarthritis, traumatic arthritis, or avascular necrosis; and · Partial revisions to replace the tibial insert of the previously implanted JOURNEY II UK knee in the femoral and tibial components are well-fixed. Unicompartmental knee implants are single use only and are intended for implantation only with bone cement.

The JOURNEY II Unicompartmental Knee System includes femoral components, tibial inserts that restore either compartment of the knee (K190085, K230653). JOURNEY II UK provides joint replacement on a single condylar compartment, meaning that only one condyle will be replaced instead of the entire femoral component replaces the damaged condylar component of the femur. The tibial baseplate replaced the damaged part of the tibial insert is the articulating surface which allows the knee to bend and flex smoothly and is placed above the tibial baseplate. The Smith & Nephew JOURNEY II Unicompartmental Knee System consists of OXINUM femoral components, titanium tibial baseplates, and cross-linked polyethylene (XLPE) tibial inserts.

The OvertureTi Knee Resurfacing System"is intended to be used in the partial replacement of the articulating surfaces of the knee in instances where, due to compartmental degenerative disease, post-traumatic degenerative disease, previous tibial condyle or plateau fractures, deformity, or previous arthroplasty, only the one side of the joint is affected. This device is intended to be used with bone cement.

The OvertureTi Knee Resurfacing System™ is comprised of femoral implants, and a set of ancillary instruments. The femoral implants are titanium and feature a spherical polished articulating surface with a titanium nitride (TiN) coating. The tibial implants are comprised of a titanium tibial tray with an integrated ultra-high molecular weight polyethylene (UHMWPE) tibial insert. The UHMVPE has Vitamin-E infused (0.1% by weight). The femoral implants and tibial trays utilize cemented pegs and porous titanium bone-contacting surfaces to allow for fixation. The femoral implant articulates against the tibial insert in a non-constrained manner. The implants are provided in a variety of configurations and sizes to accommodate various patient anatomy. Femoral implants are offered in oblong and round configurations. The oblong femoral implants are offered in lengths ranging 25-40mm and diameters ranging 17.5-27.5mm, and the round femoral implants are offered in diameters ranging 17.5-27.5mm. The tibial implants are offered in diameters ranging 17.5-22.5mm. The implants are provided gamma sterilized and individually packaged.

The Kyocera TRIBRID® Unicompartmental Knee System is indicated for use in patients with the following: - Painful and disabled knee joint resulting from osteoarthritis, or idiopathic osteonecrosis, of . either the medial or lateral compartments. - Correction of varus, valgus, or posttraumatic deformity. . - As an alternative to tibial osteotomy in patients with unicompartmental NIDJD disease. . - Revision procedures where other treatments or devices have failed. ● This device is intended for cemented use only.

KMTI's TRIBRID® Unicompartmental Knee System is a partial knee replacement prostheses intended for application with bone cement. Partial knee replacement components include femoral and tibial components. Femoral baseplates are CoCrMo Alloy while the Tibial implants are Ti6Al4V Alloy. The Tibial bearing inserts are made from Ultra-High Molecular Weight Polyethylene (UHMWPE) variations. Components are available in a variety of designs and size ranges intended for both primary and revision applications.

The Overture Resurfacing Uni Knee Resurfacing System is intended to be used in the partial replacement of the articulating surfaces of the knee in instances where, due to compartmental degenerative disease, post-traumatic degenerative disease, previous tibial condyle or plateau fractures, deformity, or previous arthroplasty, only the one side of the joint is affected. This device is intended to be used with bone cement.

The Uni Knee Resurfacing System is comprised of femoral implants, and a set of ancillary instruments. The femoral implants are titanium and feature a spherical polished articulating surface with a titanium nitride (TIN) coating. The tibial implants are comprised of a titanium tibial tray with an integrated ultra-high molecular weight polyethylene (UHMWPE) tibial insert. The femoral implants and tibial trays utilize cemented pegs and porous titanium bone-contacting surfaces to allow for fixation. The femoral implant articulates against the tibial insert in a non-constrained manner. The implants are provided in a variety of configurations and sizes to accommodate various patient anatomy. Femoral implants are offered in oblong and round configurations. The oblong femoral implants are offered in lengths ranging 25-40mm and diameters ranging 17.5-27.5mm, and the round femoral implants are offered in diameters ranging 17.5-27.5mm. The tibial implants are offered in diameters ranging 17.5-22.5mm. The implants are provided gamma sterilized and individually packaged. The ancillary instruments are provided non-sterile and are to be sterilized by the end user.

The Signature Orthopaedics' TLC Unicompartmental Knee comprising the femur component, tibial component and meniscal inserts is designed for a single compartment of the natural knee joint. The TLC Unicompartmental Knee is indicated for cemented use in partial knee arthroplasty procedures. Partial replacement of the articulating surfaces of the knee is indicated only when only one compartment of the joint is affected due to the compartmental primary degenerative or post-traumatic degenerative disease, previous tibial condyle or plateau fractures, deformity or revision of previous arthroplasty.

The TLC Unicompartmental Knee system is a modular knee system consisting of a femoral component, meniscal insert and a tibial baseplate. The femoral component is manufactured from cast cobalt chromium alloy and are intended for use with bone cement. The tibial baseplate component is manufactured from titanium alloy and intended for use with bone cement. The meniscal insert is manufactured from UHMWPE.

RESTORIS™ Multicompartmental Knee (MCK) System is indicated for single or multi-compartmental knee replacement used in conjunction with RO®, the Robotic Arm Interactive Orthopedic System, in individuals with osteoarthritis or posttraumatic arthritis of the tibiofemoral and/or patellofemoral articular surfaces. The specific knee replacement configurations include: - · Medial unicondylar - · Lateral unicondylar - · Patellofemoral - · Medial bi-compartmental (medial unicondylar and patellofemoral) RESTORIS™ Multicompartmental Knee (MCK) System is for single use only and is intended for implantation with bone cement.

The purpose of this Changes Being Effected premarket notification is to add a contraindication for the Restoris Multicompartmental Knee (MCK) System. Additionally, minor modifications are being made to the contraindications for clarity. There is no change to the intended use, indications, design, technological characteristics or operational principles for the devices. The subject implant components are identical to the predicate components. The Restoris MCK system was most recently cleared in K180612, and has also been cleared previously in K172326, K150307, K090763, K082172, K082088, K082081, and K080368.

1. Non-inflammatory degenerative joint diseases (NIDJD), e.g., osteoarthritis, avascular necrosis 2. Traumatic arthritis 3. Previous tibial condyle or plateau fracture with loss of anatomy or function 4. Varus deformities 5. Revision of the tibial bearing insert of a previously implanted unicompartmental knee system provided that the tibial tray mechanism is not compromised, and femoral and tibial tray components remain well fixed and undamaged. The BKS Uni is intended for unicompartmental knee arthroplasty procedures. The system is single-use and intended for implantation with bone cement.

The Balanced Knee® System (BKS®) Uni is a single compartment knee replacement. The BKS Uni is indicated for cemented use only. Cobalt Chromium Femoral Component The femoral components are cobalt chromium (Co-Cr-Mo). The femoral components are right and left specific and are intended for cemented use only. Titanium Tibial Trays The titanium tibial trays (Ti-6Al-4V ELI) are left and right specific and are for cemented use only. Polyethylene Tibial Insert The E-Vitalize tibial insert is manufactured from crosslinked Vitamin E Ultra High Molecular Weight Polyethylene. The inserts match the respective size of the tibial tray used.