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Fig. 4 | SpringerPlus

Fig. 4

From: Sacral orientation and Scheuermann’s kyphosis

Fig. 4

Kyphosis deformity mechanism—“Mechanical explanation”. Normal (left) versus deformed (right) spines. Note how the more horizontally oriented sacrum (right) alters the general shape of the spine and the distribution of force (Index: lg1, lever of gravity force in normal spines; lg2, lever of gravity force in deformed spines; lm1, lever of lumbar part of erector spine muscle in normal range of sacral inclination; lm2, lever of lumbar part of erector spine muscle in a decreased sacral inclination; gf1, gf2, gravity force in normal (1) versus deformed (2) spines)

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