TRAPEZOID MEMODYN for Four Corner Wrist Fusions

The TRAPEZOID MEMODYN is a specially shaped MEMODYN that provides dynamic compression of all four bones during a Four Corner Wrist Fusion.  The specially designed MEMODYN is simple to implant, low profile and provides dynamic compression compared to "static" compression of a plate system.

Surgery Technique:

1. Temporary fixation or placement of hamate, capitate, triquetrum and lunate, with proper joystick/kwire of lunate into position.
2. Using the Trapezoid Memodyn Drill Guide, drill 1.5 mm holes into each bone.
3. Implant the Trapezoid Memodyn only half way into each hole.  This will allow the surgeon to impact bonegraft through the open top of the Memodyn before        compressing the Memodyn into place.
4. Firmly push the Trapezoid Memodyn flush to each bone surface.
5. Short application of bovie to each corner of the Trapezoid Memodyn achieves compression.
6. Remove temporary fixation.

Advantages over a Plate System:

Simple implantation technique
Dynamic compression eliminates "backing out"
Dynamic compression compared to "static" compression of a plate system
Low profile, no rasping or milling out of bone required
Trapezoid design allows simple drilling implantation of Memodyn into all 4 bones eliminating placement into joint space
Heat activation of nitinol shape memory alloy Memodyn provides for dynamic and permanent compression
at fusion site, pulling all 4 bones together
Compression force 7-8 lbs.

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