Teodoro Ezequiel Guerra Marcelo, Isabel Pozzi Maria, Busin Gabriela, Crestana Zanetti Lucas, Antônio Lazzarotto Terra Lopes José, Orso Vinícius
Serviço de Ortopedia, Hospital Universitário, Universidade Luterana do Brasil (ULBRA), Canoas, RS, Brazil.
Grupo do Ombro e Cotovelo, Hospital Universitário, Universidade Luterana do Brasil (ULBRA), Canoas, RS, Brazil.
Rev Bras Ortop. 2014 Jul 16;49(5):468-72. doi: 10.1016/j.rboe.2014.07.002. eCollection 2014 Sep-Oct.
Epidemiological studies have shown laterality in clavicle fractures, such that the left side is more frequently fractured. The present study had the aim of evaluating whether the clavicle on the dominant side is denser and thus explaining the greater incidence of fractures on the non-dominant side.
This was a descriptive study on 52 healthy patients, who were classified according to age, sex and whether the dominant or non-dominant side was affected.
The participants comprised 28 women (53.8%) and 24 men (46.2%). Regarding the dominant side, 30 were right-handed (57.7%) and 22 were left-handed (42.3%). The mean age was 25 years. In this study, it could be seen that the non-dominant side had greater bone mass than the dominant side. It was also observed that the bone density was greater in the middle and distal thirds on the non-dominant side, with a statistically significant difference. In the women, the density was also greater on the non-dominant side; this difference was not significant in relation to the dominant side, but there were significant differences between the middle thirds (p < 0.001) and the distal thirds (p < 0.006).
Variations in bone density, toward higher and lower bone mass, may have been responsible for the fractures. According to the findings from this study, fractures occur more in the middle third of the non-dominant clavicle, as a result of greater bone mineral mass, which gives rise to lower flexibility and fractures in the region.
流行病学研究表明锁骨骨折存在侧别差异，左侧骨折更为常见。本研究旨在评估优势侧锁骨是否更致密，从而解释非优势侧骨折发生率更高的原因。
这是一项对52名健康患者的描述性研究，根据年龄、性别以及受影响的是优势侧还是非优势侧进行分类。
参与者包括28名女性（53.8%）和24名男性（46.2%）。关于优势侧，30人是右利手（57.7%），22人是左利手（42.3%）。平均年龄为25岁。在本研究中，可以看出非优势侧的骨量大于优势侧。还观察到非优势侧中1/3和远1/3的骨密度更高，差异具有统计学意义。在女性中，非优势侧的密度也更高；与优势侧相比，这种差异不显著，但在中1/3（p < 0.001）和远1/3（p < 0.006）之间存在显著差异。
骨密度向更高和更低骨量的变化可能是骨折的原因。根据本研究的结果，非优势侧锁骨中1/3骨折更多，这是由于骨矿物质含量更高，导致该区域柔韧性降低并发生骨折。
