[Treatment principles and outcome after fractures of the lateral humeral condyle in children].

BACKGROUND

Fractures of the lateral humeral condyle with displacement (>2 mm; <2 mm articular gap) require open reduction and stabilization. Non-displaced fractures should be treated conservatively; however, there are difficulties in the differentiation of complete (potentially unstable) an incomplete (stable) articular fractures. The aim of this study was to analyze the frequency of conservative and operative treatment approaches as well as the accuracy of treatment decisions based on fracture stability displayed on repetitive X‑rays.

MATERIAL AND METHODS

A retrospective data analysis of all lateral humeral condyles in children <16 years old treated between 2005 and 2014 was carried out. The patients were classified according to the fracture stability at the time of the incident (primarily stable or unstable) and after 4 days (secondarily stable or unstable) using conventional X‑ray images.

RESULTS

A total of 89 fractures of the lateral humeral condyle were treated (mean age 6.4 years, range 0.9-14 years). Of the fractures 52 (58%) were initially not displaced and 37 (42%) were initially displaced. The latter underwent open reduction and stabilization by osteosynthesis (primarily stable). Of the 52 initially not displaced fractures 35 remained stable and conservative treatment in a plaster cast was performed (primarily and secondarily stable). In 8 out of 52 cases a secondary displacement (>2 mm articular gap) occurred after an average of 6 days (range 3-10 days) and operative treatment was initiated (primarily stable and secondarily unstable). No follow-up x‑ray could be performed in 2 of the 52 fractures and at the end of treatment the fractures healed with displacement (primarily stable and secondarily unstable). In 7 of the 52 fractures operative treatment was performed although no displacement (primarily stable) was initially documented (overtreatment). The outcome of the whole study cohort was comparable with that described in the literature.

CONCLUSION

Treatment decisions in pediatric lateral humeral condyle fractures are based on the primary and secondary fracture stability as observed in staged follow-up radiographs. Stable fractures, whether complete or incomplete, healed with good results after conservative treatment and overtreatment could be avoided. Unstable fractures, whether primary or secondary during the course, need to be recognized as such and operative treatment with a stable osteosynthesis must be initiated.