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 Indian J Med Microbiol  
 

Figure 4: Sagittal T2-weighted MR image demonstrating the various indices predicting the risk of pathological fracture in a unicameral bone cyst. Calculation of “Bone cyst index (BCI)” first described by Kaelin and MacEwan[6] is demonstrated (in Red). BCI = [(a + b)/2 × c]/d2, which is obtained by dividing cyst area by the diameter of diaphysis squared. Calculation of “Bone cyst diameter (BCD)” first described by Ahn and Park[7] is demonstrated (in blue). BCD is expressed as the percentage of bone occupied by the cyst in transverse plane and bone cyst diameter >85% is a significant predictor of fracture. Note the thinned out cortex demonstrated (in yellow) with a minimal cortical thickness (MCT) less than 2 mm predicting a high risk of pathological fracture

Figure 4: Sagittal T2-weighted MR image demonstrating the various indices predicting the risk of pathological fracture in a unicameral bone cyst. Calculation of “Bone cyst index (BCI)” first described by Kaelin and MacEwan<sup>[6]</sup> is demonstrated (in Red). BCI = [(a + b)/2 × c]/d<sup>2</sup>, which is obtained by dividing cyst area by the diameter of diaphysis squared. Calculation of “Bone cyst diameter (BCD)” first described by Ahn and Park<sup>[7]</sup> is demonstrated (in blue). BCD is expressed as the percentage of bone occupied by the cyst in transverse plane and bone cyst diameter >85% is a significant predictor of fracture. Note the thinned out cortex demonstrated (in yellow) with a minimal cortical thickness (MCT) less than 2 mm predicting a high risk of pathological fracture