Emergency Department Management of Humeral Head Fractures
For humeral head fractures in the emergency department, obtain standard radiographs from two orthogonal views, provide pain control and sling immobilization for comfort, and order CT imaging to fully characterize the fracture pattern before definitive treatment planning. 1
Initial Imaging and Diagnosis
Standard radiographs from two levels are mandatory for initial evaluation 2. However, radiographs alone are insufficient for complete fracture characterization—poor inter-observer agreement exists when grading humeral head fractures on plain films, and nondisplaced fracture planes are frequently underappreciated due to complex bony anatomy 1.
CT without contrast is the preferred next imaging study after initial radiographs confirm a humeral head fracture 1. CT provides:
- Superior delineation of fracture patterns compared to radiographs
- Accurate identification of nondisplaced fractures (equivalent to MRI)
- Assessment of humeral neck angulation, which affects functional outcomes
- Better characterization for surgical planning
Three-dimensional volume-rendered CT images should be obtained to optimize understanding of fracture displacement and angulation 1, 2.
Immediate ED Management
Pain Control and Immobilization
- Apply a sling for comfort only—this is not for fracture stabilization 3
- The sling may be discarded as early as pain allows 3
- Provide adequate analgesia
Key Clinical Assessments
Evaluate for:
- Vascular injury: Add IV contrast to CT if arterial injury is suspected 1
- Radial nerve function: Document motor and sensory examination (nerve injury occurs in ~10% of proximal humerus fractures based on related literature)
- Associated injuries in polytrauma patients
- Fracture-dislocation requiring emergent reduction
Fracture Characterization
The Neer classification system is most commonly used 1. Critical factors to document:
- Number and position of fragments
- Degree of displacement between fragments
- Varus versus valgus positioning of the humeral head 2
- Bone quality (particularly in elderly patients)
- Presence of head-splitting or impression fractures
Important caveat: Even small incongruities between fragments in the subacromial space will impair the gliding mechanism, whereas displacement between head and shaft can be tolerated to a greater extent 2.
Disposition Planning
Non-operative candidates (can discharge with orthopedic follow-up):
- Undisplaced or minimally displaced fractures
- Reducible fractures that remain stable after closed reduction
- Elderly patients with poor bone quality and certain fracture patterns
Require orthopedic consultation in ED:
- Fracture-dislocations (emergency reduction required) 4
- Three- or four-part fractures with significant displacement
- Open fractures
- Vascular injury
- Young patients with displaced two-part fractures requiring surgical fixation
Soft Tissue Injury Considerations
Up to 40% of humeral head fractures have associated rotator cuff tears 1. However, immediate diagnosis of rotator cuff injury is not required in the ED, as:
- Significant tears are typically addressed during surgical fixation if needed
- Delayed repair up to 4 months shows no adverse outcomes 1
- MRI for rotator cuff assessment can be deferred to outpatient management for non-operative fractures
Early Rehabilitation Instructions
For patients discharged from the ED:
- Early finger motion is essential to prevent edema and stiffness 3
- Elbow, wrist, and hand motion should begin immediately
- Restrict above-chest-level activities until fracture healing is evident 3
- Avoid overly aggressive exercises that may displace fragments
Special Populations
Elderly patients (>60 years, representing 70% of cases) 2:
- Higher risk of osteoporotic bone
- May require different surgical approach or primary arthroplasty for complex fractures
- Consider fragility fracture workup and fall prevention 3
Pathological fractures:
- Consider if inadequate trauma mechanism
- May require bone scan or FDG-PET/CT for metastatic workup 1
Critical pitfall: Do not rely solely on radiographs for treatment planning. The complex anatomy and frequent underappreciation of displacement on plain films necessitate CT imaging before definitive management decisions 1.