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Avascular bone necrosis is a very rare pathological entity that can appears in an primary way or a secondary one due to diverse factors. It can be found in a few levels, especially in the femoral head and the carpal navicular bone in the adult patient. If the lession is located in the femoral head leads to a hip pain, a very frequent clinical manifestation studied in Primary Health Care centers, so it is very important its early and differential diagnosis, above all, in the case that exist riskdoi:10.4321/s1131-57682002000100007 fatcat:snnbyo74uzhxvbdpvmwfsjwvo4