Non-simultaneous bilateral XXXX : epidemiologic study of 241 @entity173 .

@entity1 @entity2249 @entity174 @entity170 @entity173
INTRODUCTION: @entity173 are an important public health problem given their growing incidence as well as their functional and vital repercussions. With longer survival, @entity1 with a contralateral @entity174 are increasingly numerous. The objective of this study was to investigate the bilateralization of @entity173 in terms of anatomic location and time to the second @entity174 . HYPOTHESIS: Contralateral @entity174 are of the same anatomical type as the primary @entity174 . @entity1 AND METHODS: This was a retrospective epidemiological study on all @entity1 managed for @entity173 between January 2007 and May 2008. Each case of bilateralization was studied. RESULTS: We included 241 @entity1 in the study. The mean age at occurrence of the primary @entity174 was 83.3 years (range, 60-99 years). The distribution showed 45.6% true @entity2249 and 54.4% trochanteric @entity174 . Twenty-six of the 241 @entity1 had already suffered from a @entity173 (10.8%). This @entity174 was the same type as the recent @entity174 in 80.8% of the cases. The mean time between the two @entity174 was 5.6 years (range, 1-277 months). DISCUSSION: The contralateral @entity174 were the same anatomical type as the primary @entity174 in eight out of ten @entity1 and the symmetry remains intact in 64-83% depending on the series. The @entity174 occurred on average within 5 years of the first @entity173 . In cases of asymmetry, the second @entity174 was more often a trochanteric @entity174 . The causes explaining this symmetry are several and are poorly known. The risk factors are numerous and their prevention is essential (acting on the @entity1 's environment to prevent falls, rehabilitation to reestablish autonomy after the first @entity174 , and preventive treatment of @entity170 ), although these notions are often ignored by surgeons. LEVEL OF EVIDENCE: IV, retrospective study.
