Lateral condylar fractures of the humerus

Cite this article as:
Dunlop, L. Lateral condylar fractures of the humerus, Don't Forget the Bubbles, 2020. Available at:
http://doi.org/10.31440/DFTB.21030

Six-year-old William was playing hopscotch in the playground but fell, landing on his left outstretched hand. Afterwards he complained of left elbow pain and was taken to the local Emergency Department. He was told that he had a lateral condylar fracture of the humerus…

 

Epidemiology 

This is a relatively common fracture in the paediatric population and occurs mainly in children below the age of 7 years old, with a mean age of 6. It accounts for approximately 10-20% of paediatric elbow fractures and is the second most common intra-articular fracture.

 

History 

The most common aetiology for this fracture is a fall onto an outstretched hand. The patient will complain of pain to the lateral aspect of the elbow. The level of pain may be low in minimally displaced fractures.

 

Examination

Have a look at our post on elbow examination for tips on how to do a full assessment of a child’s elbow.

Inspection of the joint will reveal an elbow with swelling to the lateral aspect. There is usually minimal deformity. Bruising may indicate a brachioradialis tear and therefore likely instability. Tenderness is usually limited to the lateral aspect and crepitus may be palpated on movement. Wrist flexion and extension may reproduce the pain.

It is important to carefully examine the joint below and above the injured area. Don’t forget to examine the rest of the child for other injuries.

Remember to be suspicious of non-accidental injury in cases where there are inconsistencies in the history and injury type.

 

Investigations

AP and lateral x-rays of the elbow are required. Oblique views can be valuable if no fracture is seen on lateral or AP views but clinical suspicion remains. This is where your knowledge of the ossification centres comes into play (for detail on this see CRITOE). The ossification centres appear on x-rays in the order: Capitellum, Radial head, Internal epicondyle, Trochlea, Olecranon and the External epicondyle, also known as the lateral condyle. The lateral epicondyle appears at the age of 8-12 years old and fuses at age 12-14 years old.

The paediatric elbow is largely cartilaginous. Lateral condylar fractures often only affect the cartilaginous part of the humerus. As cartilage is not radiopaque, the true extent of the fracture is often not fully understood when looking at the x-ray.

The presence of anterior and posterior fat pads may often be the only indication that a fracture is present.

The most commonly associated fracture is the ipsilateral elbow dislocation (usually posterolaterally) and ipsilateral humeral fractures (most commonly the olecranon). Ensure you obtain radiographs for other suspected fractures.

 Lateral condyle fractures can be classified depending on their x-ray appearances.

 

Classification

There are several different classification methods. The most common classifications as below.

Milch Classification
Type 1The fracture line is lateral to the trochlear groove… not into the humero-ulnar joint
Type 2The fracture line is medial to the trochlear groove and is, therefore, a fracture-dislocation and unstable.

 

Milch Classification

 

Jakob Classification
Stage 1<2mm displacement, which indicates intact cartilaginous hinge
Stage 22-4mm of displacement
Stage 3>4mm displacement with rotation of the fragment

 

Jakob Classification

 

Immediate treatment in the ED

Provide immediate adequate analgesia to the child prior to any examination or investigation.

If the fracture is open, conservatively manage the wound, consider tetanus status and antibiotics.

Keep the child nil by mouth as they may need urgent surgery.

 

Treatment following imaging

Treatment depends on the degree of displacement of the fracture.

Due to the high complication rate of these fractures, all lateral condylar fractures should be referred for to the on-call orthopaedic team while in the Emergency Department.

 

Jakob classificationTreatment optionFollow up
Stage 1 (<2mm of displacement)Conservative management with immobilisation with above elbow cast to 90 degrees.Weekly imaging in fracture clinic with the cast in place for 4-6 weeks.
Stage 2 and 3 (> 2mm with or without rotation)These all must go to theatre and have closed reduction with percutaneous pinning or open reduction with screw fixation.3-6 weeks in above-elbow cast and orthopaedic follow up.

 

Areas of controversy

Serial radiographs are often recommended in the management of conservative management minimally or undisplaced lateral condylar fractures. A systematic review by Tan et al 2018 found that serial X-rays have no clinical significance. However, if the 1 week up x-ray is not satisfactory, this should be followed up appropriately under the patient’s treating orthopaedic team.

 

Potential complications

This type of fracture is associated with a high rate of complications, which usually develop later, during the healing process.

The reduction must be accurate. If there is malunion, the fragment does not adequately unite or the epiphyseal plate is damaged then complications may occur:

  • Stiffness is the most common complication, usually fully resolving by 48 weeks.
  • Delayed union occurs if the fracture has not healed after 6 weeks. This usually occurs if the fracture visible at 2 weeks.
  • Non-union is more likely when delayed union occurs.
  • Cubitus valgus deformity occurs with lateral physeal growth arrest.
  • Delayed “tardy ulnar palsy” may develop as the child grows and the ulnar nerve is stretched across the elbow with valgus deformity.
  • Avascular necrosis may develop 1-3 years after the fracture.

Image from wikimedia.org

 

Do not miss bits

Lateral condylar fractures of the humerus can present with minimal pain or deformity and can be missed (16.6% misdiagnosed as presented by Tan et al 20181). Due to the high rate of complication, it is important that we do not miss these fractures.

  

William was found to have an isolated Jakob stage 3 type lateral condylar fracture and was taken to theatre that evening. Open reduction was required, and internal screw fixation secured the fragment. His cast was removed 4 weeks after and his joint mobility continues to improve.

 

 

References

Bowden G, McNally MA, Thomas RYW, Gibson A. 2013. Oxford Handbook of Orthopaedics and Trauma, Oxford Medical Publications. Page 564-5

Dandy DJ, Edwards DJ, 2003. Essential Orthopaedics and Trauma, Fourth Edition, Churchill Livingstone, page 197.

Raby N, Berman L, Morley S, de Lacey G. 2015. Accident and Emergency Radiology: A survival Guide Third Edition, Sauders Elsevier page 106-110.

Shaath k, Souder C, Skaggs D. 2019. Orthobullets, Lateral Condyle Fracture – Pediatric Accessed 06/04/2019 https://www.orthobullets.com/pediatrics/4009/lateral-condyle-fracture–pediatric

Tan SHS, Dartnell J, Lim AKS, Hui JH. Paediatric lateral condyle fractures: a systematic review. Arch Orthop Trauma Surg. 2018 Jun;138(6):809-817. doi: 10.1007/s00402-018-2920-2. Epub 2018 Mar 24. Review. PubMed PMID: 29574555.

 

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About Lisa Dunlop

AvatarI am an Emergency Medicine trainee in the West of Scotland having recently made the move up back form London. I have an interest in major trauma and toxicology. Outside of work I am a keen cyclist, runner and collector of all things plants.

Avatar
Author: Lisa Dunlop I am an Emergency Medicine trainee in the West of Scotland having recently made the move up back form London. I have an interest in major trauma and toxicology. Outside of work I am a keen cyclist, runner and collector of all things plants.

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