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RE: Assessment of the utility of using intra- and intervertebral minimum sagittal diameter ratios in the diagnosis of cervical vertebral malformation in horses.

Hahn et al. Vet Radiol Ultrasound, 2008;49:1–6. inline image

The authors recognize that Fig. 1 and its legend contained errors and were confusing as published.

To calculate the intervertebral sagittal ratio, the minimum intravertebral diameter (a) is expressed as a ratio of that diameter (a) to the maximal height of the cranial vertebral physis of that vertebra (A), or (a/A). The minimum intervertebral diameter (i.e. the smallest of line b or c), however, is expressed as a ratio of that diameter (b or c) to the maximal height of the cranial vertebral physis of the more caudal vertebra (B), or (b/B or c/B).