Scapholunate Interval Variability in the Pediatric Population
Julie E Johnson, MD; Juan Giugale, MD; Tiffany Kadow, MD; John R. Fowler, MD
Orthopaedic Surgery, UPMC, Pittsburgh, PA
Purpose: Children are frequently referred for consultation regarding a widened scapholunate (SL) joint on radiograph. The purpose of this study is to determine the SL interval mean and standard deviation by age and gender in the pediatric population.
Methods: Our radiology department generated a consecutive list of pediatric patients who had wrist radiographs between 1/1/12 and 12/31/14. Exclusion criteria for this study were: poor quality radiograph, not a true PA view, presence of trauma or anomaly, and duplicate patients. For radiographs that met inclusion, the distance between the scaphoid bone and the lunate bone were measured at the midpoint on the standard PA view. The SL interval was measured digitally and recorded in millimeters. Other data recorded included age in years and gender. The average and standard deviation for SL interval were calculated for each gender and age at time of radiograph.
Results: A total of 4,661 pediatric wrist radiographs were reviewed. Of those, 1,009 met inclusion criteria and the SL interval was measured. There were 550 males (55%) and 459 females (45%) included in the study. SL interval and standard deviation for age and gender are shown in the graph below.
Conclusions: Measureable SL interval decreases with age until skeletal maturity and there is more variation in SL interval with younger age. On average, SL interval in the pediatric population is narrower in girls than boys. SL interval > 2mm in a child does not infer injury of the SL ligament.
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