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Treatment of displaced femoral neck fractures in young patients with DHS and its association to osteonecrosis

The purpose of this study is to evaluate the performance of dynamic hip screw for the treatment of dislocated femoral neck fractures in young patients, focusing on osteonecrosis. A series of 53 patients with less than 55 years of age were retrospectively evaluated. All patients had dislocated femora...

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Published in:Revista brasileira de ortopedia 2018-01, Vol.53 (1), p.82-87
Main Authors: Schwartsmann, Carlos Roberto, Lammerhirt, Henrique Marquardt, Spinelli, Leandro de Freitas, Ungaretti Neto, Ary da Silva
Format: Article
Language:English
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Summary:The purpose of this study is to evaluate the performance of dynamic hip screw for the treatment of dislocated femoral neck fractures in young patients, focusing on osteonecrosis. A series of 53 patients with less than 55 years of age were retrospectively evaluated. All patients had dislocated femoral neck fractures (Garden III or IV) and were treated with DHS. Ficat's staging system was used to evaluate avascular necrosis. There were 38 (71.7%) males and 15 (28.3%) females, with an overall mean age at the onset of fracture of 41.9 years (±12.8). According to Garden's classification, 21 (39.6%) fractures were classified as type III and 32 (60.4%) were considered totally dislocated, Garden IV. Fracture healing was achieved in 39 patients (73.6%). Thirteen cases of avascular necrosis were observed (24.6%). The incidence of avascular necrosis in young patients with a displaced femoral neck fractures treated with DHS was 24.6%. No statistically significant association was found between times elapsed to surgery, fracture displacement, and presence of derotation screw with osteonecrosis. Level of evidence IV. O objetivo deste estudo foi avaliar o desempenho do dynamic hip screw (DHS) no tratamento de fraturas do colo femoral deslocadas em pacientes jovens, com foco na osteonecrose. Uma série de 53 pacientes com menos de 55 anos de idade foram avaliados retrospectivamente. Todos os pacientes apresentaram fraturas do colo femoral deslocadas (Garden III ou IV) e foram tratados com DHS. O sistema de estadiamento de Ficat foi utilizado para avaliar a necrose avascular. Foram incluídos 38 (71,7%) pacientes do sexo masculino e 15 (28,3%) do sexo feminino, com idade média no momento da fratura de 41,9 anos (±12,8). Segundo a classificação de Garden, 21 (39,6%) fraturas foram classificadas como tipo III e 32 (60,4%) foram considerados totalmente deslocadas, Garden IV. A consolidação da fratura foi obtida em 39 pacientes (73,6%). Foram observados treze casos de necrose avascular (24,6%). A incidência de necrose avascular em pacientes jovens com fraturas deslocadas do colo do fêmur tratados com DHS foi de 24,6%. Não houve associação estatisticamente significante entre os intervalo até a cirurgia, o deslocamento da fratura e a presença de parafuso anti-rotacional com a osteonecrose. Nível de evidência IV.
ISSN:2255-4971
1982-4378
2255-4971
DOI:10.1016/j.rboe.2017.03.003