• OBJECTIVE
    • To determine humeral diaphyseal fractures at risk for nonunion with functional brace treatment.
  • DESIGN
    • Retrospective case series.
  • SETTING
    • A single surgeon's practice.
  • PATIENTS
    • Forty-nine of 52 consecutive patients treated nonoperatively for an isolated diaphyseal fracture of the humerus during a 6-year period were followed until either union and full or near-full restoration of shoulder and elbow motion, or until 6 months had passed, or until a reconstructive surgery was performed (average follow-up 14 months; range 2 to 50 months).
  • INTERVENTION
    • Functional fracture brace.
  • MAIN OUTCOME MEASUREMENTS
    • Radiographic and clinical union.
  • RESULTS
    • Union was achieved in 44 of 49 patients (90%) with no more than 15-degree loss of shoulder or elbow motion in any patient. Four of 14 proximal-third fractures (29%), one of 22 middle-third fractures (4%), and none of the 13 distal-third fractures failed to heal.
  • CONCLUSIONS
    • Proximal-third long oblique fractures may be at greater than average risk for nonunion after functional fracture bracing.
  • LEVEL OF EVIDENCE
    • Level IV (case series).