Displaced fractures through UBC in the calcaneus are uncommon. Treatment for asymptomatic cases consists of observation and follow-up radiographs to insure the lesion is not growing or changing. Painful cysts can be treated with a wide variety of more or less invasive techniques and there is a lack of consensus as to the optimum choice of treatment. Minimally invasive techniques including aspiration and injection with methylprednisolone, bone marrow, autogenous or allogenous bone graft or bone graft substitutes, or a combination of these, or curettage without grafting, creating multiple drill holes, or percutaneous screw decompression. All of these techniques have been shown to be effective for some cysts. Virtually all the reports in the literature, however, have a relatively low level of evidence (level III, IV, V). New reports from a randomized, multi-center trial are due out soon, which apparently show no significant benefit for bone matrix or bone marrow preparations over simple injections of methylprednisolone. However, the biological mode of action of the injections remains unknown. Various technical factors have been proposed that may increase the success rate of steroid injections, including wide spacing of the needles to ensure complete exposure of the lesion, and using radiological dye to insure complete filling of the lesion. These techniques may decrease the need for multiple injections. The author of this site recommends that simple treatments with minimal morbidity be tried first, and that more invasive, expensive, and risky interventions be reserved for difficult cases.