后屈和侧屈都会疼，坐着、前屈、扭转就更糟。

Sitting, forward bending, and twisting movements often make it worse, and back and sidebending can also be painful.

youdao

如果你的骶髂关节已经错位，那么做扭转和前屈时应更加小心。

If your sacroiliac is already out, then twists and forward bends can be especially problematic.

youdao

当你上体前屈时，脊椎向前移动，但骨盆和骶骨却要保持在原处，特别是屈膝的一侧。

As you begin to bend forward, the spine moves while the pelvis and sacrum tend to remain behind, especially on the side with the knee drawn back.

youdao