脊柱侧弯患者坐位时，臀部下面加垫，到底是垫哪一边？施罗斯是这样解释的。

根据第五步骨盆矫正方案，三弯脊柱侧弯患者可使用矫正垫；仅当需要降低肋骨隆起下方的髋部位置，或腰椎凸侧僵硬且无法调整时才可使用。静态平衡不得向右偏移。若存在第四弯，则无需使用此垫，因为它会增加腰骶部的曲度。

仅当存在单侧臀肌萎缩（由小儿麻痹症等疾病引起）时，才在胸椎凸侧下方放置垫子。目标是使骨盆保持水平。在所示案例中，由于垫子会增加腰椎曲度，因此必须省略。在矫正四弯脊柱侧弯时，若腰椎凸侧的腿部外展，则可能需要使用垫子。这将使骨盆处于水平位置。
Corrective cushions in accordance with the 5th pelvic correction for three-curve scoliosis; applied only if the hip below the rib hump has to be lowered or if the lumbar convexity is inflexible and cannot be influenced. The statics must not be shifted towards the right. If a fourth curve is present, this cushion is omitted because it would increase the lumbosacral curvature.
A cushion is placed underneath the thoracic convex side only if there is unilateral gluteal atrophy (caused by polio and such disorders). A horizontal pelvis is the goal. In the case shown, the cushion has to be omitted because it increases the lumbar curvature. A cushion may be necessary in the case of a correction of four-curve scoliosis when the leg on the side of the lumbar convexity is splayed. This will move the pelvis into a horizontal position.