Athletic trainers should be alert to the unusual possibility of bone cysts, which are usually identified incidentally when radiographs are obtained for other reasons. Most simple bone cysts are asymptomatic, but a pathologic fracture can occur with trauma.

Intercomparisons between flow stress, microhardness, and rosette sizemeasurements for purified KCl single crystals, KCl:Ca, KCl:Sr, and KClxKBr1−x mixed single crystals are made. A good correlation between the flow stress and inverse of the length ofthe dislocation rosette size was found for this crystal system. These results, along with the results of other investigators [1 to 3] show that once a rosette size versus flow stress calibration has been made for a particular crystal system, the rosette size becomes a useful, simple, nearly nondestructive technique for determining the flow stress of a crystal.