Medacta | MyKnee | Which Medical Device
From Which Medical Device
The MyKnee® Patient Matched Instrumentation system from Medacta is one of a number of emerging customised jig systems for primary knee replacement, in this case the Medacta GMK knee. Benefits of these systems are said to include better implant positioning, a more streamlined procedure involving fewer steps and instrument trays and the ability to avoid instrumenting the femoral canal. The preoperative planning process involves protocolled MRI or CT scan data being uploaded to an online system. During this process, the surgeon can determine implant size, distal and posterior resections, flexion/extension and varus/valgus positioning of the femoral component, varus/valgus of the tibial component and rotation of the components. The system then generates a report for verification by the surgeon. Once verified, the blocks are manufactured from Polyamide polymer and have unique patient identifiers on them.
There are different variants of the blocks depending on the surgical approach selected, and whether CT or MRI data have been used for planning. Care must be taken to avoid removing osteophytes before placing the blocks as these are used to seat the blocks. The blocks provide guidance for the distal and anterior femoral and tibial cuts. A standard cutting block is required for the distal femoral chamfers. The blocks include holes for alignment rods for checking. We are not aware of published results. This system received FDA approval in 2010.
In 2012, the MyKnee Ligament Balancing System (LBS) became available. This is a femoral cutting block with an integrated ligament balancing device.
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