At 8 months of age, the sensitivity and specificity of the OFA - like radiograph was 38 and 96 %, respectively and for the distraction index (values of > 0.7 considered abnormal) were 50 and 89 %, respectively and for
the dorsolateral subluxation score (scores < 55 % were considered abnormal) was 83 and 84 %, respectively.
Several techniques have been developed to allow earlier diagnosis of HD such as the PennHIP distraction index,
the dorsolateral subluxation score (DLS), and the Flückiger technique.