Table 1 Koo et al. Criteria for osteopenia of prematurity

Grade 0:

Normal density of bone cortex along shaft with normal dense white line at metaphysis and normal band of lucency, and thinning of cortex.

Grade 1:

Loss of dense white line at the metaphysis, increased sub-metaphyseal lucency and thinning of cortex.

Grade 2:

Changes in grade 1 plus irregularity and fraying of metaphysis, with splaying and cupping that is indicative of rickets.

Grade 3:

Indications of rickets with evidence of fractures.