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Decisions (Arms cannulated? (Cannulated, Flat, Partially cannulated), Arm…
Decisions
Arms cannulated?
Cannulated
Flat
Partially cannulated
Arm width
3.2mm
2.5mm
3.5mm
Arm stability during insertion
Pull back
Friction
Barrel
Arm/slot
Joint
Tapered slot
At expansion
At unexpansion
Spring
Expander assembly
Already in
Hollow back
Attach screw driver over bolt
Expander inserted
Over k-wire (cannulated)
Not over k-wire (k-wire in center of expander)
Outer Arm profile
Flat
5.2mm radiused
Cannulation diameter
2.5mm
3.2mm
Removal action
Threaded tool engage with barrel
Reverse expander screw (screw coupled with barrel)