Infantile Supracondylar Humeral Fractures (Patients Less Than Two Years of Age): Twice as Common in Females and a High Rate of Malunion with Lateral Column-Only Fixation.

Abstract

The age range for supracondylar humeral fractures spans from 1 to 14 years of age; most published studies have analyzed patients as non-age-segregated cohorts. Some isolated studies focused on the upper age range, demonstrating a male predominance and more severe fractures. The purpose of the current study was to analyze a large cohort of patients with surgically treated supracondylar humeral fractures at the low end of the age range (<2 years of age). Patients <2 years of age were identified from surgical billing records. Pin constructs were categorized as lateral column-only fixation or medial and lateral column fixation. All patients were followed through fracture-healing. Substantial loss of reduction was defined as a Baumann angle that changed ≥10° between surgery and healing or as a lateral rotation percentage (i.e., Gordon index) of ≥50% at the time of healing. The Fisher exact test was used for statistical analysis. One hundred and three patients met our inclusion criteria. There were 69 female and 34 male patients (a 2:1 female-to-male ratio). Two patients did not have adequate follow-up radiographs. Of the 46 patients with bicolumnar fixation, 5 (11%) demonstrated loss of reduction compared with 20 (36%) of 55 patients with lateral column-only fixation. This difference between the groups was significant (p = 0.005). The group with lateral column-only fixation had 4.7-times-higher odds of loss of reduction (95% confidence interval, 1.6 to 13.8). A subset of patients had in-cast imaging that allowed calculation of the posterior sagittal cast index (a measure of cast fit). Eight of 15 patients who had a posterior sagittal cast index of ≥0.20 experienced loss of reduction, while only 1 of 19 patients with a cast index value of <0.20 had loss of reduction (p = 0.004). Supracondylar humeral fractures were twice as common in females in this very young cohort. We also found a nearly 5-times-higher odds of loss of reduction when fracture fixation was of the lateral column only. Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.