Lower back strain is acute pain caused by damage to the muscles and ligaments of the back.

腰扭伤是腰部的肌肉、韧带受伤引起的急性疼痛。

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The majority of overexertion injuries - 60% - result in back strain, particularly in the lower back.

受伤的过劳多数- 60% -在背部的结果，尤其是在腰部。

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Scottish study published in 2007 found that leaning back at 135 degrees is ideal to prevent back strain.

苏格兰的一项于2007年发表了论文的研究发现，角度为135度的后仰坐姿对防止背部酸痛最为有利。

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Swann will fly home from the Australia tour on Wednesday because of a lower back strain.

BBC: Injured Graeme Swann to miss England ODIs in Australia

Smith was later forced to leave the field with a back strain, handing over the wicket-keeping gloves to Dougie Lockhart.

BBC: SPORT | Cricket | Counties | Lancashire close in on C&G final

Third baseman Will Middlebrooks, on the DL since May 24 with a lower back strain, is on track to be activated Thursday.

WSJ: Ellsbury out with tight left groin