Anatomically based classification of medial clavicle fractures.

Area of Science:

• Orthopedic surgery
• Radiology
• Biomedical engineering

Background:

• Medial clavicle fractures are rare, accounting for less than 5% of all clavicle injuries.
• Current classification systems may lack reliability for these specific fractures.
• Understanding fracture patterns is crucial for predicting clinical outcomes.

Purpose of the Study:

• To evaluate the reliability of a novel, anatomically based (AB) classification system for medial clavicle fractures.
• To compare the reliability of the AB system against existing Edinburgh (ED) and Throckmorton (TR) classifications.
• To assess the clinical outcomes of nonoperatively treated medial clavicle fractures.

Main Methods:

• 3D reconstruction of 55 acute medial clavicle fractures from 55 patients.
• Evaluation of fractures using the Edinburgh (ED), Throckmorton (TR), and new anatomically based (AB) classification systems.
• Retrospective clinical evaluation of 38 patients using the Oxford Shoulder and Constant Score.

Main Results:

• The anatomically based (AB) classification demonstrated the highest inter- and intra-observer reliability.
• Displaced fractures originating medial to the costoclavicular ligament resulted in significantly lower Constant and Oxford scores.
• The AB classification categorizes fractures as medial (Type 1) or lateral (Type 2) to the costoclavicular ligament and as non-displaced (Type A) or displaced (Type B).

Conclusions:

• The novel anatomically based (AB) classification system offers superior reliability for medial clavicle fractures.
• Displaced medial clavicle fractures, as defined by the AB system, are associated with poorer clinical outcomes.
• This classification may aid in predicting prognosis and guiding treatment for medial clavicle injuries.