活动过度，即骶髂关节运动太多，是支持关节的韧带松弛造成的。
Hypermobility, or too much movement in the sacroiliac joints, is a result of loose ligaments supporting the joints.
松弛素有助于骨盆打开，让胎儿从母体中出来，但松弛素也会影响脚部韧带，使脚部韧带松弛。
Relaxin helps the pelvis spread so the baby can exit the body, but it also affects the ligaments in the feet, causing a stretching of those ligaments.
隧道内口可吸收螺钉挤压固定，愈合后内口消失，可避免韧带撞击内口使之逐渐扩大引起重建韧带松弛。
The tunnel disappears after the screw is absorbed, avoiding the ligament's bump toward the inside tunnel, which leads to gradual extension of the inside tunnel and cause the ligament flabby.
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