Executive Editor: Chris Colton

Authors: Mariusz Bonczar, Daniel Rikli, David Ring

Distal humerus 13-C1 Open reduction; parallel (uniplanar) plating

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Glossary

1 Principles top

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Triangle of stability-concept

The mechanical properties of the distal humerus are based on a triangle of stability, comprising the medial and lateral columns, and the articular surface.
In C-type fractures, all 3 columns have to be restored.

2 Opening the joint top

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Cleaning of the fracture site

Clean out the fracture by removing blood clots, loose pieces of bone, and any interposed tissue.

3 Reduction and provisional fixation top

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Fixation of small articular fragments

Assemble any small fragments covered by cartilage, even if they have no soft tissue connection. A headless screw, buried threaded wire, or absorbable pin is each a good option for fixing such fragments.

Allthough the C1 fracture is, by definition, not comminuted, in many instances, small articular fragments may be found.


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K-wire fixation

In parallel plating it is customary to reduce and secure provisionally all of the fracture fragments, prior to plate application, using K-wires.

4 Definitive plate and screw fixation top

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Plate selection and contouring

Contoured 3.5-millimeter reconstruction plates, or precontoured plates, are selected for direct lateral positioning on the lateral column and direct medial positioning on the medial column.

These are usually placed slightly posteriorly and are always placed on top of the soft tissues—do NOT strip the medial and lateral columns.

The plates should extend distally enough to engage all fracture fragments and proximally enough so that 2 or 3 screws through each plate engage the proximal (shaft) fragment.


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Drilling for distal screws

As many screws as possible are placed in each distal fragments.
Each screw goes through a plate hole.
Smooth K-wires the same size as the appropriate drill (e.g. 2.0 mm wire for 2.7mm screw) can be inserted through the plate holes to ensure that the screws, once inserted do not conflict: this also allows the drilling stage to be skipped.


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Distal screw application

Each of the smooth K-wires is exchanged for a self-tapping screw.

5 Proximal plate fixation top

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Compression technique

When there is solid bony contact across the articular and proximal fragments, compression is applied with pointed reduction forceps and eccentrically placed load screws, one column at a time.


Alternatives

  1. When a column is comminuted, it should be bridged, and if necessary, because of missing fragments, bone grafted.
  2. When the reassembled condylar mass is short, and non-locking plates are used, long, distal-to-proximal, 3.5 mm column screws will enhance the stability of the fixation.

6 Osteosynthesis of the olecranon osteotomy top

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Drill hole for wire

Using a 2.5 mm drill, make a coronal hole in the proximal ulna from ulnar to radial side, to pass the figure-of-eight wire.


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Insert wire

Prepare a 0.8 mm  wire by making a loop approximately one third along its length. Insert the shorter segment of the wire through this drill hole.


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Reduction of the olecranon

Reduce the olecranon osteotomy with pointed reduction forceps.


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K-wire location

Use the figure-of-eight tension band wiring technique to obtain stable fixation. Two K-wires are drilled parallel across the osteotomy.


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The K-wires can be directed down the shaft of the ulna, or alternatively aimed anterior so that they engage the anterior ulnar cortex, just distal to the coronoid process: this may help to limit the potential for wire migration.


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Obtain correct K-wire tension

The wire loop has to go underneath the triceps tendon.

Double twist the wire loop to obtain equal tension on both sides. The cut wire loops are then impacted firmly onto the bony cortex of the ulna.

Cut the wires to the appropriate length and bend them. Impact the bend K-wire tip into the olecranon, being sure to bury them beneath the triceps tendon.


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Completed osteosynthesis of olecranon

The illustration shows the completed osteosynthesis of the olecranon.

7 Completed osteosynthesis top

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Final fixation

Note that the plates rest on top of the muscle origins and these have NOT been stripped or removed.

v1.0 2016-10-21