手臂充分伸展，肘关节伸直离开地。

Stretch your arms fully and lift your elbows off the floor.

保持你的肘关节伸直并且避免倾斜。

Keep your elbow straight and avoid leaning over.

目的明确桡骨头在肘关节中的应力传导作用。

Objective the role of the radial head in stress transmission to the elbow.

方法：将前臂伸肌腱附丽从肱骨外髁处剥下，充分暴露肘关节前外侧关节囊。

Methods: Take the forearm extensor tendon insertion site off the extracondyle of humerus and have the anterior lateral aricular capsule of elbow joint shown.