Fig. 1From: Relationship between sacral-abdominal wall distance, movement performance, and spinal alignment in osteoporosis: a retrospective studySacral-abdominal wall distance (SAD). (a) Tip of abdominal wall in soft tissue condition, (b) Posterior edge of the superior margin of the first sacral vertebra in bone condition, (c) SAD is the distance between the tip of the abdominal wall and the posterior edge of the upper margin of the first sacral vertebra.Back to article page