Medacta Shoulder System - Introduction; K-Wire Positioning; Back Surface Reaming

GRAB Instruments Surgical Technique
4
1. INTRODUCTION
This surgical technique describes how to harvest a bone
graft from the humeral head and how to shape it.
This surgical technique is not recommended in cases of
humeral head necrosis, humeral head fractures and
revision of failed total or hemi arthroplasty.
In these cases, an allograft should be used and shaped with
the instruments.
This operating technique is independent of the chosen
approach.
2. K-WIRE POSITIONING
Position the Humeral K-wire Positioner onto the center of
the humeral head in order to match the bone convexity.
Insert the Ø2.5mm K-wire through the central hole of the
Humeral K-wire Positioner and drill until it penetrates the
lateral cortex. Placement through the lateral cortex will
prevent K-wire migration during the subsequent steps.
1.
Remove the instrument, leaving the K-wire in place.
3. BACK SURFACE REAMING
Connect the Reamer Ø27mm to the Reamer Handle and
slide them over the Ø2.5mm K-wire. Ream the humeral
head surface until the Reamer is completely in contact with
the bone.
2.
Extract the instrument, leaving the K-wire in place.