Executive Editor: Chris Colton

Authors: Mariusz Bonczar, Daniel Rikli, David Ring

Distal humerus 13-B3.3 Open reduction; screw fixation +/- protection plate

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Glossary

1 Introduction top

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B1.3 and B3.3 fractures overlap

As partial articular fractures become more complex and multifragmentary, the  B1.3 and B3.3 fractures start to overlap. B1.3 fractures feature coronal fracture lines that create separate capitellar and trochlear fragments. B3.3 fractures are often associated with impaction of the posterior part of the lateral column, and/or the posterior trochlea. These fracture types will therefore be considered together.


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Apparent capitellar fractures

Most apparently isolated capitellar fractures are more complex than they initially appear.

Computed tomography - particularly 3D CT - can help define the fracture anatomy and facilitate planning of the surgery.


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The “double arc” sign

 


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Radiographs are insufficient

Sometimes the appearance is more complex, but it can be difficult to understand the fracture pattern on standard radiographs, particularly if a cast obscures the view.


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3D CT

Computed tomography with, 3-dimensional reconstruction in particular, is very useful for understanding apparently simple capitellar fractures that turn out to be more complex.


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Lateral epicondylar fracture

Here it is apparent that the lateral epicondyle is fractured.

The posterior aspect of the lateral column is also abnormal.


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Posterior impaction

In this image, it is apparent that the articular fragments may not fit, suggesting impaction of the posterior trochlea and particularly the lateral column.


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Extension to the medial side

An end-on view shows the complexity, particularly on the lateral side.

Also one can see a fracture—albeit very subtle— between the medial epicondyle and the medial trochlea.


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3D CT evidence of impaction

Here the medial side fracture can be seen as well as what appears to be impaction (narrowing of the olecranon fossa).  These injuries are very subtle, but were confirmed during operative exposure.

2 Reduction top

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Cleaning of the fracture site

The fracture surfaces are cleared of clot and debris.


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Realignment of fragments

The fracture fragments are pieced together like a puzzle.


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When the pieces do not fit

If the pieces do not fit properly, this is usually a result of impaction of the posterior aspect of the lateral column, and sometimes of the posterior trochlea.


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Posterior view of impaction

A posterior view of the impaction of the posterior aspect of the lateral column.


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Disimpact with an osteotome

If impaction is identified, this should be gently disimpacted with a fine osteotome used as a lever.

3 Provisional fixation top

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The disimpacted fragments can be provisionally stabilized with smooth K-wires.

4 Definitive fixation (extensile lateral approach) top

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Fixation of entirely articular fragments

Entirely articular fragments can be secured with buried headless screws, small threaded K-wires, or absorbable pins.

This illustration shows insertion of a headless double-pitch screw.


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Repair of the lateral epicondyle

The lateral epicondyle can be provisionally fixed with a K-wire. Small epicondylar fractures may benefit from fixation with a tension band wire that incorporates the soft tissue attachments.

Use a large gauge needle to pass the wire through the soft tissues on the lateral epicondyle.


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Tension wire fixation of lateral epicondyle

The wire is passed through a drill hole in the lateral column proximally, in a figure-of-8 fashion and tensioned to achieve stable fixation.


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Plate fixation of lateral epicondyle

Larger partially articular fragments can be fixed with an additional plate and screws.


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The final combined fixation.

5 Fixation via olecranon osteotomy top

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Indication

Fractures that involve the posterior aspect of the trochlea, or of the medial epicondyle, may be best treated via an olecranon osteotomy.


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Olecranon osteotomy

An olecranon osteotomy provides exposure to the entire articular surface.


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Mobilization of impacted fragments

The posterior trochlea is gently disimpacted using a fine osteotome as a lever. Care is taken to try to preserve some of the inherent stability.


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The lateral column must also be disimpacted.


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End-on view of the disimpaction.


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Headless screws

Headless screws, cannulated or non-cannulated, can be used to secure articular fragments that are large enough and have adequate bone quality.


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Plate fixation

Dedicated plates with many small distal screws can be used to engage the subchondral bone of the articular fracture fragments. Alternatively, standard reconstruction plates are used, as illustrated.


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Final fixation

Medial and lateral plates were used here to stabilize a complex articular comminution.

6 Alternative fixation - buttress plate top

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Case presentation

This fracture involves the capitellum and lateral condyle.


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Preoperative plan

In some patients there may be sufficient nonarticular fragment surfaces to use headed screws and buttress plates.

As an alternative to headless screws inserted through the articular surface, screws entering the posterior, nonarticular aspect of the lateral column can be used.


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Final fixation

Two screws enter the nonarticular lateral ridge of the capitellum. The two plates provide an additional buttressing effect and the most distal screw in the lateral plate helps to secure the articular fragments.

This alternative is most useful for relatively simple fractures with sufficient nonarticular fracture surface.

v1.0 2016-10-21