1.It's gonna be a hairline metacarpal fracture.

骨轻微骨裂。

2.It's a minor break in the fifth metacarpal.

第五骨有一点小骨折。

3.Clean fracture of the metacarpal bone.

骨骨折了。

4.But the underlying structures of the humerus, radius and ulna, and metacarpals, are shared.

但肱骨、桡骨和尺骨以及骨的基础结构共享的。机翻

5.Broken knuckles, also known as metacarpal fractures, are fairly common, leading to the term “boxer’s fracture” or “brawler’s fracture”.

指关节骨折， 也称为骨骨折， 相当常见，导致术语“拳击手骨折”或“斗殴者骨折” 。机翻

6.These muscles include the flexor digitorum profundus which flexes the fingers at the interphalangeal joints, and the extensor digitorum which hyperextend them at the metacarpal phalangeal joint.

群包括指深屈（在指间关节处使手指屈曲）及指伸（在指关节处使手指过伸）。

7.Finally, both the ulnar and median nerves innervate the lumbricals, which are 4 muscles that extend the fingers at the interphalangeal joints, and keep them flexed at the metacarpal phalangeal joints.

最后，尺神经和正中神经都支配蚓状，这四条蚓状能使指间关节的手指伸直，同时指关节保持屈曲位。