Compound fracture in his left arm.

复合型左臂骨折。

It is a compound fracture.

它是有创骨折。

What if he suffers a simple or a compound fracture?

如果是单纯性或复合性骨折呢？

He fell from his horse and sustained a compound fracture.

他从马上摔下来，造成复合骨折。

Another kind of fracture break is an open or compan compound fracture.

另一种骨折是开放性骨折，即复合式骨折。