What is the recommended management for a trabecular microfracture of the clavicle identified on MRI?

Management of Trabecular Microfracture of the Clavicle

Conservative management with sling immobilization is the appropriate treatment for trabecular microfractures of the clavicle, as these represent stress injuries with bone marrow edema rather than displaced structural fractures requiring surgical intervention.

Understanding Trabecular Microfractures

Trabecular microfractures of the clavicle represent a spectrum of stress-related bone injury characterized by:

• Bone marrow edema as the primary MRI finding, appearing as diffuse signal changes most conspicuous on STIR sequences 1, 2
• Subchondral trabecular disruption without cortical breach or significant displacement 1
• Association with repetitive stress rather than acute traumatic displacement 2

These injuries differ fundamentally from the displaced midshaft or distal clavicle fractures addressed in surgical guidelines 3.

Conservative Management Protocol

Immobilization with a simple sling is the standard approach for non-displaced or minimally displaced clavicle injuries 4:

• Apply sling immobilization for comfort and protection 4
• Duration typically 2-4 weeks based on symptom resolution
• No evidence supports rigid figure-of-eight bracing over simple sling for these injuries 4

Activity modification is essential:

• Avoid repetitive overhead activities and heavy lifting during the healing phase 2
• Gradual return to activity as symptoms permit
• Tobacco cessation counseling, as smoking increases nonunion risk even in minor fractures 3

Expected Clinical Course

Natural history favors complete resolution with conservative care:

• Follow-up MRI in conservatively managed cases shows normalization of marrow signal intensity when patients become asymptomatic 2
• Bone marrow edema resolves over 3-6 months with activity modification 2
• High healing potential without surgical intervention 5

When Surgical Referral Is NOT Indicated

Trabecular microfractures do not meet criteria for orthopedic surgical referral, which are reserved for 6:

• Displaced midshaft fractures with >2 cm shortening

• 100% displacement of fracture fragments

• Unstable distal clavicle fractures with coracoclavicular ligament disruption
• Open fractures or neurovascular compromise

Key distinction: MRI bone marrow edema and trabecular microfractures represent pre-fracture or incomplete stress injury, not the displaced structural fractures that benefit from surgical fixation 1, 2.

Imaging Pitfalls to Avoid

• Do not mistake bone marrow edema for acute displaced fracture requiring surgery 2
• STIR sequences may show dramatic signal changes that appear more severe than the actual structural injury 2
• Correlation with plain radiographs is essential—absence of cortical disruption or displacement confirms conservative management 4
• Upright radiographs better assess true displacement than supine views if structural fracture is suspected 6

Follow-Up Strategy

Clinical reassessment at 2-4 weeks:

• Evaluate pain resolution and return of shoulder function
• Repeat imaging only if symptoms persist beyond 6-8 weeks or worsen 2
• Refer to orthopedics only if radiographs demonstrate progression to displaced fracture (rare scenario)

Red flags requiring urgent reassessment:

• Development of skin tenting or neurovascular symptoms
• Significant increase in deformity suggesting fracture displacement
• Failure to improve with 6-8 weeks of conservative care