青少年腕部尺骨变异的定义：检查技术与观察者间信度

Purpose:The measurement technique for ulnar variance in the adolescent population has not been well established. The purpose of this study was to assess the reliability of a standard ulnar variance assessment in the adolescent population.  Methods:Four orthopedic surgeons measured 138 adolescent wrist radiographs for ulnar variance using a standard technique. There were 62 male and 76 female radiographs obtained in a standardized fashion for subjects aged 12 to 18years. Skeletal age was used for analysis. We determined mean variance and assessed for differences related to age and gender. We also determined the interrater reliability.  Results:The mean variance was −0.7mm for boys and −0.4mm for girls; there was no significant difference between the 2 groups overall. When subdivided by age and gender, the younger group (≤15y of age) was significantly less negative for girls (boys, −0.8mm and girls, −0.3mm, p<.05). There was no significant difference between boys and girls in the older group. The greatest difference between any 2 raters was 1mm; exact agreement was obtained in 72 subjects. Correlations between raters were high (rp 0.87–0.97 in boys and 0.82–0.96 for girls). Interrater reliability was excellent (Cronbach's alpha, 0.97–0.98).   Conclusions:Standard assessment techniques for ulnar variance are reliable in the adolescent population. Open growth plates did not interfere with this assessment. Young adolescent boys demonstrated a greater degree of negative ulnar variance compared with young adolescent girls.