The AC joint axes are aligned consistently with how the axes are described for the scapula on the thorax, such that if the scapula upwardly rotates, posteriorly tilts or internally rotates relative to the clavicle, there is a 1:1 “coupling” with ST motion.

논문 일부분인데요 해석이안되 미치겠어요 ㅠㅠ

문장이 길어서 머리아프고..으아아아악....부탁드려도 될까여.ㅠㅠㅠㅠㅠ살려주세여..